Study of the doubly charmed tetraquark [Formula: see text]

Quantum chromodynamics, the theory of the strong force, describes interactions of coloured quarks and gluons and the formation of hadronic matter. Conventional hadronic matter consists of baryons and mesons made of three quarks and quark-antiquark pairs, respectively. Particles with an alternative quark content are known as exotic states. Here a study is reported of an exotic narrow state in the D0D0π+ mass spectrum just below the D*+D0 mass threshold produced in proton-proton collisions collected with the LHCb detector at the Large Hadron Collider. The state is consistent with the ground isoscalar [Formula: see text] tetraquark with a quark content of [Formula: see text] and spin-parity quantum numbers JP = 1+. Study of the DD mass spectra disfavours interpretation of the resonance as the isovector state. The decay structure via intermediate off-shell D*+ mesons is consistent with the observed D0π+ mass distribution. To analyse the mass of the resonance and its coupling to the D*D system, a dedicated model is developed under the assumption of an isoscalar axial-vector [Formula: see text] state decaying to the D*D channel. Using this model, resonance parameters including the pole position, scattering length, effective range and compositeness are determined to reveal important information about the nature of the [Formula: see text] state. In addition, an unexpected dependence of the production rate on track multiplicity is observed.

Evidence for an η c ( 1 S ) π - resonance in B 0 → η c ( 1 S ) K + π - decays

A Dalitz plot analysis of B 0 → η c ( 1 S ) K + π - decays is performed using data samples of pp collisions collected with the LHCb detector at centre-of-mass energies of s = 7 , 8 and 13 Te V , corresponding to a total integrated luminosity of 4.7 fb - 1 . A satisfactory description of the data is obtained when including a contribution representing an exotic η c ( 1 S ) π - resonant state. The significance of this exotic resonance is more than three standard deviations, while its mass and width are 4096 ± 20 - 22 + 18 Me V and 152 ± 58 - 35 + 60 Me V , respectively. The spin-parity assignments J P = 0 + and J P = 1 - are both consistent with the data. In addition, the first measurement of the B 0 → η c ( 1 S ) K + π - branching fraction is performed and gives B ( B 0 → η c ( 1 S ) K + π - ) = ( 5.73 ± 0.24 ± 0.13 ± 0.66 ) × 10 - 4 , where the first uncertainty is statistical, the second systematic, and the third is due to limited knowledge of external branching fractions.

Search for lepton-flavour-violating decays of Higgs-like bosons

A search is presented for a Higgs-like boson with mass in the range 45 to 195 GeV / c 2 decaying into a muon and a tau lepton. The dataset consists of proton-proton interactions at a centre-of-mass energy of 8 TeV , collected by the LHCb experiment, corresponding to an integrated luminosity of 2 fb - 1 . The tau leptons are reconstructed in both leptonic and hadronic decay channels. An upper limit on the production cross-section multiplied by the branching fraction at 95% confidence level is set and ranges from 22 pb for a boson mass of 45 GeV / c 2 to 4 pb for a mass of 195 GeV / c 2 .

Studies of the resonance structure in D 0 → K ∓ π ± π ± π ∓ decays

Amplitude models are constructed to describe the resonance structure of D 0 → K - π + π + π - and D 0 → K + π - π - π + decays using pp collision data collected at centre-of-mass energies of 7 and 8 TeV with the LHCb experiment, corresponding to an integrated luminosity of 3.0  f b - 1 . The largest contributions to both decay amplitudes are found to come from axial resonances, with decay modes D 0 → a 1 ( 1260 ) + K - and D 0 → K 1 ( 1270 / 1400 ) + π - being prominent in D 0 → K - π + π + π - and D 0 → K + π - π - π + , respectively. Precise measurements of the lineshape parameters and couplings of the a 1 ( 1260 ) + , K 1 ( 1270 ) - and K ( 1460 ) - resonances are made, and a quasi model-independent study of the K ( 1460 ) - resonance is performed. The coherence factor of the decays is calculated from the amplitude models to be R K 3 π = 0.459 ± 0.010 ( stat ) ± 0.012 ( syst ) ± 0.020 ( model ) , which is consistent with direct measurements. These models will be useful in future measurements of the unitary-triangle angle γ and studies of charm mixing and C P violation.

Updated search for long-lived particles decaying to jet pairs

A search is presented for long-lived particles with a mass between 25 and 50 GeV / c 2 and a lifetime between 2 and 500 ps, using proton-proton collision data corresponding to an integrated luminosity of 2.0 fb - 1 , collected by the LHCb detector at centre-of-mass energies of 7 and 8 TeV. The particles are assumed to be pair-produced in the decay of a 125 GeV / c 2 Standard-Model-like Higgs boson. The experimental signature is a single long-lived particle, identified by a displaced vertex with two associated jets. No excess above background is observed and limits are set on the production cross-section as a function of the mass and lifetime of the long-lived particle.

Improved limit on the branching fraction of the rare decay K S 0 → μ + μ -

A search for the decay K S 0 → μ + μ - is performed, based on a data sample of proton-proton collisions corresponding to an integrated luminosity of 3 fb - 1 , collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV . The observed yield is consistent with the background-only hypothesis, yielding a limit on the branching fraction of B ( K S 0 → μ + μ - ) < 0.8 ( 1.0 ) × 10 - 9 at 90 % ( 95 % ) confidence level. This result improves the previous upper limit on the branching fraction by an order of magnitude.

Study of charmonium production in b -hadron decays and first evidence for the decay B s 0 → ϕ ϕ ϕ

Using decays to ϕ -meson pairs, the inclusive production of charmonium states in b -hadron decays is studied with pp collision data corresponding to an integrated luminosity of 3.0 fb - 1 , collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. Denoting by B C ≡ B ( b → C X ) × B ( C → ϕ ϕ ) the inclusive branching fraction of a b hadron to a charmonium state C that decays into a pair of ϕ mesons, ratios R C 2 C 1 ≡ B C 1 / B C 2 are determined as R η c ( 1 S ) χ c 0 = 0.147 ± 0.023 ± 0.011 , R η c ( 1 S ) χ c 1 = 0.073 ± 0.016 ± 0.006 , R η c ( 1 S ) χ c 2 = 0.081 ± 0.013 ± 0.005 , R χ c 0 χ c 1 = 0.50 ± 0.11 ± 0.01 , R χ c 0 χ c 2 = 0.56 ± 0.10 ± 0.01 and R η c ( 1 S ) η c ( 2 S ) = 0.040 ± 0.011 ± 0.004 . Here and below the first uncertainties are statistical and the second systematic. Upper limits at 90% confidence level for the inclusive production of X(3872), X(3915) and χ c 2 ( 2 P ) states are obtained as R χ c 1 X ( 3872 ) < 0.34 , R χ c 0 X ( 3915 ) < 0.12 and R χ c 2 χ c 2 ( 2 P ) < 0.16 . Differential cross-sections as a function of transverse momentum are measured for the η c ( 1 S ) and χ c states. The branching fraction of the decay B s 0 → ϕ ϕ ϕ is measured for the first time, B ( B s 0 → ϕ ϕ ϕ ) = ( 2.15 ± 0.54 ± 0.28 ± 0 . 21 B ) × 10 - 6 . Here the third uncertainty is due to the branching fraction of the decay B s 0 → ϕ ϕ , which is used for normalization. No evidence for intermediate resonances is seen. A preferentially transverse ϕ polarization is observed. The measurements allow the determination of the ratio of the branching fractions for the η c ( 1 S ) decays to ϕ ϕ and p p ¯ as B ( η c ( 1 S ) → ϕ ϕ ) / B ( η c ( 1 S ) → p p ¯ ) = 1.79 ± 0.14 ± 0.32 .

Search for massive long-lived particles decaying semileptonically in the LHCb detector

A search is presented for massive long-lived particles decaying into a muon and two quarks. The dataset consists of proton-proton interactions at centre-of-mass energies of 7 and 8 TeV, corresponding to integrated luminosities of 1 and 2[Formula: see text], respectively. The analysis is performed assuming a set of production mechanisms with simple topologies, including the production of a Higgs-like particle decaying into two long-lived particles. The mass range from 20 to 80 [Formula: see text] and lifetimes from 5 to 100[Formula: see text] are explored. Results are also interpreted in terms of neutralino production in different R-Parity violating supersymmetric models, with masses in the 23-198 GeV/[Formula: see text] range. No excess above the background expectation is observed and upper limits are set on the production cross-section for various points in the parameter space of theoretical models.

Measurement of the phase difference between short- and long-distance amplitudes in the [Formula: see text] decay

A measurement of the phase difference between the short- and long-distance contributions to the [Formula: see text] decay is performed by analysing the dimuon mass distribution. The analysis is based on pp collision data corresponding to an integrated luminosity of 3[Formula: see text] collected by the LHCb experiment in 2011 and 2012. The long-distance contribution to the [Formula: see text] decay is modelled as a sum of relativistic Breit-Wigner amplitudes representing different vector meson resonances decaying to muon pairs, each with their own magnitude and phase. The measured phases of the [Formula: see text] and [Formula: see text] resonances are such that the interference with the short-distance component in dimuon mass regions far from their pole masses is small. In addition, constraints are placed on the Wilson coefficients, [Formula: see text] and [Formula: see text], and the branching fraction of the short-distance component is measured.

Observation of [Formula: see text] and [Formula: see text] decays

The decays [Formula: see text] and [Formula: see text] are observed for the first time using a data sample corresponding to an integrated luminosity of 3.0 fb[Formula: see text], collected by the LHCb experiment in proton-proton collisions at the centre-of-mass energies of 7 and 8[Formula: see text]. The branching fractions relative to that of [Formula: see text] are measured to be [Formula: see text]where the first uncertainties are statistical and the second are systematic.

Search for Higgs-like bosons decaying into long-lived exotic particles

A search is presented for massive long-lived particles, in the 20-60 [Formula: see text] mass range with lifetimes between 5 and 100 [Formula: see text]. The dataset used corresponds to 0.62[Formula: see text] of proton-proton collision data collected by the LHCb detector at [Formula: see text]. The particles are assumed to be pair-produced by the decay of a Higgs-like boson with mass between 80 and 140 [Formula: see text]. No excess above the background expectation is observed and limits are set on the production cross-section as a function of the long-lived particle mass and lifetime and of the Higgs-like boson mass.

A precise measurement of the [Formula: see text] meson oscillation frequency

The oscillation frequency, [Formula: see text], of [Formula: see text] mesons is measured using semileptonic decays with a [Formula: see text] or [Formula: see text] meson in the final state. The data sample corresponds to 3.0[Formula: see text] of pp collisions, collected by the LHCb experiment at centre-of-mass energies [Formula: see text] = 7 and 8[Formula: see text]. A combination of the two decay modes gives [Formula: see text], where the first uncertainty is statistical and the second is systematic. This is the most precise single measurement of this parameter. It is consistent with the current world average and has similar precision.

Search for long-lived heavy charged particles using a ring imaging Cherenkov technique at LHCb

A search is performed for heavy long-lived charged particles using 3.0 [Formula: see text] of proton-proton collisions collected at [Formula: see text][Formula: see text] 7 and 8  TeV with the LHCb detector. The search is mainly based on the response of the ring imaging Cherenkov detectors to distinguish the heavy, slow-moving particles from muons. No evidence is found for the production of such long-lived states. The results are expressed as limits on the Drell-Yan production of pairs of long-lived particles, with both particles in the LHCb pseudorapidity acceptance, [Formula: see text]. The mass-dependent cross-section upper limits are in the range 2-4 fb (at 95 % CL) for masses between 14 and 309 [Formula: see text].

Search for Hidden-Sector Bosons in B(0)→K(*0)μ(+)μ(-) Decays

A search is presented for hidden-sector bosons, χ, produced in the decay B(0)→K*(892)(0)χ, with K*(892)(0)→K(+)π(-) and χ→μ(+)μ(-). The search is performed using pp-collision data corresponding to 3.0  fb(-1) collected with the LHCb detector. No significant signal is observed in the accessible mass range 214≤m(χ)≤4350  MeV, and upper limits are placed on the branching fraction product B(B(0)→K*(892)(0)χ)×B(χ→μ(+)μ(-)) as a function of the mass and lifetime of the χ boson. These limits are of the order of 10(-9) for χ lifetimes less than 100 ps over most of the m(χ) range, and place the most stringent constraints to date on many theories that predict the existence of additional low-mass bosons.

Measurement of the [Formula: see text] production cross-section in proton-proton collisions via the decay [Formula: see text]

The production of the [Formula: see text] state in proton-proton collisions is probed via its decay to the [Formula: see text] final state with the LHCb detector, in the rapidity range [Formula: see text] and in the meson transverse-momentum range [Formula: see text]. The cross-section for prompt production of [Formula: see text] mesons relative to the prompt [Formula: see text] cross-section is measured, for the first time, to be [Formula: see text] at a centre-of-mass energy [Formula: see text] using data corresponding to an integrated luminosity of 0.7 fb[Formula: see text], and [Formula: see text] at [Formula: see text] using 2.0 fb[Formula: see text]. The uncertainties quoted are, in order, statistical, systematic, and that on the ratio of branching fractions of the [Formula: see text] and [Formula: see text] decays to the [Formula: see text] final state. In addition, the inclusive branching fraction of [Formula: see text]-hadron decays into [Formula: see text] mesons is measured, for the first time, to be [Formula: see text], where the third uncertainty includes also the uncertainty on the [Formula: see text] inclusive branching fraction from [Formula: see text]-hadron decays. The difference between the [Formula: see text] and [Formula: see text] meson masses is determined to be [Formula: see text].

Search for long-lived particles decaying to jet pairs

A search is presented for long-lived particles with a mass between 25 and 50 [Formula: see text] and a lifetime between 1 and 200[Formula: see text] in a sample of proton-proton collisions at a centre-of-mass energy of [Formula: see text] TeV, corresponding to an integrated luminosity of 0.62 [Formula: see text], collected by the LHCb detector. The particles are assumed to be pair-produced by the decay of a standard model-like Higgs boson. The experimental signature of the long-lived particle is a displaced vertex with two associated jets. No excess above the background is observed and limits are set on the production cross-section as a function of the long-lived particle mass and lifetime.

Measurement of Bc+ Production in Proton-Proton Collisions at √[s]=8 TeV

Production of Bc+ mesons in proton-proton collisions at a center-of-mass energy of 8 TeV is studied with data corresponding to an integrated luminosity of 2.0  fb-1 recorded by the LHCb experiment. The ratio of production cross sections times branching fractions between the Bc+→J/ψπ+ and B+→J/ψK+ decays is measured as a function of transverse momentum and rapidity in the regions 0<pT<20  GeV/c and 2.0<y<4.5. The ratio in this kinematic range is measured to be (0.683±0.018±0.009)%, where the first uncertainty is statistical and the second systematic.

Observation of two new Ξ(b)(-) baryon resonances

Two structures are observed close to the kinematic threshold in the Ξ(b)(0)π(-) mass spectrum in a sample of proton-proton collision data, corresponding to an integrated luminosity of 3.0  fb(-1), recorded by the LHCb experiment. In the quark model, two baryonic resonances with quark content bds are expected in this mass region: the spin-parity J(P)=(1/2)(+) and J(P)=(3/2)(+) states, denoted Ξ(b)('-) and Ξ(b)(*-). Interpreting the structures as these resonances, we measure the mass differences and the width of the heavier state to be m(Ξ(b)('-))-m(Ξ(b)(0))-m(π(-))=3.653±0.018±0.006  MeV/c(2), m(Ξ(b)(*-))-m(Ξ(b)(0))-m(π(-))=23.96±0.12±0.06  MeV/c(2), Γ(Ξ(b)(*-))=1.65±0.31±0.10  MeV, where the first and second uncertainties are statistical and systematic, respectively. The width of the lighter state is consistent with zero, and we place an upper limit of Γ(Ξ(b)('-))<0.08  MeV at 95% confidence level. Relative production rates of these states are also reported.

Precision measurement of CP violation in B(S)(0)→J/ΨK+K- decays

The time-dependent CP asymmetry in B(s)(0)→J/ψK+K- decays is measured using pp collision data, corresponding to an integrated luminosity of 3.0  fb-1, collected with the LHCb detector at center-of-mass energies of 7 and 8 TeV. In a sample of 96,000 B(s)(0)→J/ψK+K- decays, the CP-violating phase ϕs is measured, as well as the decay widths ΓL and ΓH of the light and heavy mass eigenstates of the B(s)(0)-B[over ¯]s0 system. The values obtained are ϕs=-0.058±0.049±0.006  rad, Γs≡(ΓL+ΓH)/2=0.6603±0.0027±0.0015  ps-1, and ΔΓs≡ΓL-ΓH=0.0805±0.0091±0.0032  ps-1, where the first uncertainty is statistical and the second, systematic. These are the most precise single measurements of those quantities to date. A combined analysis with Bs0→J/ψπ+π- decays gives ϕs=-0.010±0.039  rad. All measurements are in agreement with the standard model predictions. For the first time, the phase ϕs is measured independently for each polarization state of the K+K- system and shows no evidence for polarization dependence.

Measurement of the semileptonic CP asymmetry in B0-B[over ¯]0 mixing

The semileptonic CP asymmetry in B0-B[over ¯]0 mixing, a(sl)(d), is measured in proton-proton collision data, corresponding to an integrated luminosity of 3.0  fb-1, recorded by the LHCb experiment. Semileptonic B0 decays are reconstructed in the inclusive final states D-μ+ and D*-μ+, where the D- meson decays into the K+π-π- final state and the D*- meson into the D[over ¯]0(→K+π-)π- final state. The asymmetry between the numbers of D(*)-μ+ and D(*)+μ- decays is measured as a function of the decay time of the B0 mesons. The CP asymmetry is measured to be a(sl)(d)=(-0.02±0.19±0.30)%, where the first uncertainty is statistical and the second systematic. This is the most precise measurement of a(sl)(d) to date and is consistent with the prediction from the standard model.

Precision measurement of the mass and lifetime of the Ξb⁻ baryon

We report on measurements of the mass and lifetime of the Ξ(b)⁻ baryon using about 1800 Ξ(b)⁻ decays reconstructed in a proton-proton collision data set corresponding to an integrated luminosity of 3.0  fb⁻¹ collected by the LHCb experiment. The decays are reconstructed in the Ξ(b)⁻→Ξ(c)⁰π⁻, Ξ(c)⁰→pK⁻K⁻π⁺ channel and the mass and lifetime are measured using the Λ(b)⁰→Λ(c)⁺π⁻ mode as a reference. We measure M(Ξ(b)⁻)-M(Λ(b)⁰)=178.36±0.46±0.16  MeV/c², (τ(Ξ(b)⁻)/τ(Λ(b)⁰)=1.089±0.026±0.011, where the uncertainties are statistical and systematic, respectively. These results lead to a factor of 2 better precision on the Ξ(b)⁻ mass and lifetime compared to previous best measurements, and are consistent with theoretical expectations.

Measurement of the CP-violating phase ϕs in Bs(0)→Ds(+)Ds(-) decays

We present a measurement of the CP-violating weak mixing phase ϕs using the decay Bs(0)→Ds(+)Ds(-) in a data sample corresponding to 3.0 fb(-1) of integrated luminosity collected with the LHCb detector in pp collisions at center-of-mass energies of 7 and 8 TeV. An analysis of the time evolution of the system, which does not use the constraint |λ|=1 to allow for the presence of CP violation in decay, yields ϕs=0.02±0.17(stat)±0.02(syst)  rad, |λ|=0.91(-0.15)(+0.18)(stat)±0.02(syst). This result is consistent with the standard model expectation.

Measurement of charged particle multiplicities and densities in [Formula: see text] collisions at [Formula: see text]TeV in the forward region

Charged particle multiplicities are studied in proton-proton collisions in the forward region at a centre-of-mass energy of [Formula: see text]TeV with data collected by the LHCb detector. The forward spectrometer allows access to a kinematic range of [Formula: see text] in pseudorapidity, momenta greater than [Formula: see text] and transverse momenta greater than [Formula: see text]. The measurements are performed using events with at least one charged particle in the kinematic acceptance. The results are presented as functions of pseudorapidity and transverse momentum and are compared to predictions from several Monte Carlo event generators.

Measurement of [Formula: see text] polarisation in [Formula: see text] collisions at [Formula: see text] = 7 TeV

The polarisation of prompt [Formula: see text] mesons is measured by performing an angular analysis of [Formula: see text] decays using proton-proton collision data, corresponding to an integrated luminosity of 1.0[Formula: see text], collected by the LHCb detector at a centre-of-mass energy of 7 TeV. The polarisation is measured in bins of transverse momentum [Formula: see text] and rapidity [Formula: see text] in the kinematic region [Formula: see text] and [Formula: see text], and is compared to theoretical models. No significant polarisation is observed.

Measurement of the [Formula: see text] meson lifetime using [Formula: see text] decays

The lifetime of the [Formula: see text] meson is measured using semileptonic decays having a [Formula: see text] meson and a muon in the final state. The data, corresponding to an integrated luminosity of [Formula: see text], are collected by the LHCb detector in [Formula: see text] collisions at a centre-of-mass energy of 8 TeV. The measured lifetime is [Formula: see text]where the first uncertainty is statistical and the second is systematic.

Search for Majorana neutrinos in B- → π+ μ- μ- decays

A search for heavy Majorana neutrinos produced in the B- → π+ μ- μ- decay mode is performed using 3  fb(-1) of integrated luminosity collected with the LHCb detector in pp collisions at center-of-mass energies of 7 and 8 TeV at the LHC. Neutrinos with masses in the range 250 to 5000 MeV and lifetimes from zero to 1000 ps are probed. In the absence of a signal, upper limits are set on the branching fraction B(B- → π+ μ- μ-) as functions of neutrino mass and lifetime. These limits are on the order of 10(-9) for short neutrino lifetimes of 1 ps or less. Limits are also set on the coupling between the muon and a possible fourth-generation neutrino.

Measurements of indirect CP asymmetries in D0 → K- K+ and D0 → π- π+ decays

A study of indirect CP violation in D0 mesons through the determination of the parameter AΓ is presented using a data sample of pp collisions, corresponding to an integrated luminosity of 1.0  fb(-1), collected with the LHCb detector and recorded at the center-of-mass energy of 7 TeV at the LHC. The parameter AΓ is the asymmetry of the effective lifetimes measured in decays of D0 and D0 mesons to the CP eigenstates K- K+ and π- π+. Fits to the data sample yield AΓ(KK)=(-0.35±0.62±0.12)×10(-3) and AΓ(ππ)=(0.33±1.06±0.14)×10(-3), where the first uncertainties are statistical and the second systematic. The results represent the world's best measurements of these quantities. They show no difference in AΓ between the two final states and no indication of CP violation.

Measurement of CP violation in the phase space of B± → K+ K- π± and B± → π+ π- π± decays

The charmless decays B± → K+ K- π± and B± → π+ π- π± are reconstructed in a data set of pp collisions with an integrated luminosity of 1.0  fb(-1) and center-of-mass energy of 7 TeV, collected by LHCb in 2011. The inclusive charge asymmetries of these modes are measured to be A(CP)(B± → K+ K- π±) = -0.141±0.040  (stat)±0.018 (syst)±0.007(J/ψ K±) and A(CP)(B± → π+ π- π±) = 0.117±0.021 (stat)±0.009 (syst)±0.007(J/ψ K±), where the third uncertainty is due to the CP asymmetry of the B± → J/ψK± reference mode. In addition to the inclusive CP asymmetries, larger asymmetries are observed in localized regions of phase space.

Measurement of D0-D0 mixing parameters and search for CP violation using D0 → K+ π- decays

Measurements of charm mixing parameters from the decay-time-dependent ratio of D0 → K+ π- to D0 → K- π+ rates and the charge-conjugate ratio are reported. The analysis uses data, corresponding to 3  fb(-1) of integrated luminosity, from proton-proton collisions at 7 and 8 TeV center-of-mass energies recorded by the LHCb experiment. In the limit of charge-parity (CP ) symmetry, the mixing parameters are determined to be x'2=(5.5±4.9)×10(-5), y'=(4.8±1.0)×10(-3), and RD=(3.568±0.066)×10(-3). Allowing for CP violation, the measurement is performed separately for D0 and D0 mesons yielding AD=(-0.7±1.9)%, for the direct CP-violating asymmetry, and 0.75<|q/p|<1.24 at the 68.3% confidence level, for the parameter describing CP violation in mixing. This is the most precise determination of these parameters from a single experiment and shows no evidence for CP violation.

Measurement of J/ψ polarization in pp collisions at [Formula: see text]

An angular analysis of the decay J/ψ→μ+μ- is performed to measure the polarization of prompt J/ψ mesons produced in pp collisions at [Formula: see text]. The dataset corresponds to an integrated luminosity of 0.37 fb-1 collected with the LHCb detector. The measurement is presented as a function of transverse momentum, pT, and rapidity, y, of the J/ψ meson, in the kinematic region 2 Collapse

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Affiliation(s)

The LHCb Collaboration CERN, 1211 Geneva 23, Switzerland
R. Aaij Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands
C. Abellan Beteta Universitat de Barcelona, Barcelona, Spain
B. Adeva Universidad de Santiago de Compostela, Santiago de Compostela, Spain
M. Adinolfi H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom
C. Adrover CNRS/IN2P3, CPPM, Aix-Marseille Université, Marseille, France
A. Affolder Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom
Z. Ajaltouni CNRS/IN2P3, LPC, Clermont Université, Université Blaise Pascal, Clermont-Ferrand, France
J. Albrecht Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany
F. Alessio European Organization for Nuclear Research (CERN), Geneva, Switzerland
M. Alexander School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom
S. Ali Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands
G. Alkhazov Petersburg Nuclear Physics Institute (PNPI), Gatchina, Russia
P. Alvarez Cartelle Universidad de Santiago de Compostela, Santiago de Compostela, Spain
A. A. Alves Sezione INFN di Roma La Sapienza, Roma, Italy European Organization for Nuclear Research (CERN), Geneva, Switzerland
S. Amato Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
S. Amerio Sezione INFN di Padova, Padova, Italy
Y. Amhis LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France
L. Anderlini Sezione INFN di Firenze, Firenze, Italy
J. Anderson Physik-Institut, Universität Zürich, Zürich, Switzerland
R. Andreassen University of Cincinnati, Cincinnati, OH United States
R. B. Appleby School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom
O. Aquines Gutierrez Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany
F. Archilli Laboratori Nazionali dell’INFN di Frascati, Frascati, Italy
A. Artamonov Institute for High Energy Physics (IHEP), Protvino, Russia
M. Artuso Syracuse University, Syracuse, NY United States
E. Aslanides CNRS/IN2P3, CPPM, Aix-Marseille Université, Marseille, France
G. Auriemma Sezione INFN di Roma La Sapienza, Roma, Italy
S. Bachmann Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
J. J. Back Department of Physics, University of Warwick, Coventry, United Kingdom
C. Baesso Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro, Brazil
V. Balagura Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia
W. Baldini Sezione INFN di Ferrara, Ferrara, Italy
R. J. Barlow School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom
C. Barschel European Organization for Nuclear Research (CERN), Geneva, Switzerland
S. Barsuk LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France
W. Barter Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom
Th. Bauer Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands
A. Bay Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
J. Beddow School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom
F. Bedeschi Sezione INFN di Pisa, Pisa, Italy
I. Bediaga Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil
S. Belogurov Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia
K. Belous Institute for High Energy Physics (IHEP), Protvino, Russia
I. Belyaev Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia
E. Ben-Haim LPNHE, Université Pierre et Marie Curie, Université Paris Diderot, CNRS/IN2P3, Paris, France
M. Benayoun LPNHE, Université Pierre et Marie Curie, Université Paris Diderot, CNRS/IN2P3, Paris, France
G. Bencivenni Laboratori Nazionali dell’INFN di Frascati, Frascati, Italy
S. Benson School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
J. Benton H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom
A. Berezhnoy Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia
R. Bernet Physik-Institut, Universität Zürich, Zürich, Switzerland
M.-O. Bettler Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom
M. van Beuzekom Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands
A. Bien Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
S. Bifani University of Birmingham, Birmingham, United Kingdom
T. Bird School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom
A. Bizzeti Sezione INFN di Firenze, Firenze, Italy
P. M. Bjørnstad School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom
T. Blake European Organization for Nuclear Research (CERN), Geneva, Switzerland
F. Blanc Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
J. Blouw Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
S. Blusk Syracuse University, Syracuse, NY United States
V. Bocci Sezione INFN di Roma La Sapienza, Roma, Italy
A. Bondar Budker Institute of Nuclear Physics (SB RAS) and Novosibirsk State University, Novosibirsk, Russia
N. Bondar Petersburg Nuclear Physics Institute (PNPI), Gatchina, Russia
W. Bonivento Sezione INFN di Cagliari, Cagliari, Italy
S. Borghi School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom
A. Borgia Syracuse University, Syracuse, NY United States
T. J. V. Bowcock Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom
E. Bowen Physik-Institut, Universität Zürich, Zürich, Switzerland
C. Bozzi Sezione INFN di Ferrara, Ferrara, Italy
T. Brambach Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany
J. van den Brand Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, The Netherlands
J. Bressieux Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
D. Brett School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom
M. Britsch Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany
T. Britton Syracuse University, Syracuse, NY United States
N. H. Brook H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom
H. Brown Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom
I. Burducea Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania
A. Bursche Physik-Institut, Universität Zürich, Zürich, Switzerland
G. Busetto Sezione INFN di Padova, Padova, Italy
J. Buytaert European Organization for Nuclear Research (CERN), Geneva, Switzerland
S. Cadeddu Sezione INFN di Cagliari, Cagliari, Italy
O. Callot LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France
M. Calvi Sezione INFN di Milano Bicocca, Milano, Italy
M. Calvo Gomez Universitat de Barcelona, Barcelona, Spain
A. Camboni Universitat de Barcelona, Barcelona, Spain
P. Campana Laboratori Nazionali dell’INFN di Frascati, Frascati, Italy European Organization for Nuclear Research (CERN), Geneva, Switzerland
D. Campora Perez European Organization for Nuclear Research (CERN), Geneva, Switzerland
A. Carbone Sezione INFN di Bologna, Bologna, Italy
G. Carboni Sezione INFN di Roma Tor Vergata, Roma, Italy
R. Cardinale Sezione INFN di Genova, Genova, Italy
A. Cardini Sezione INFN di Cagliari, Cagliari, Italy
H. Carranza-Mejia School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
L. Carson Imperial College London, London, United Kingdom
K. Carvalho Akiba Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
G. Casse Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom
L. Castillo Garcia European Organization for Nuclear Research (CERN), Geneva, Switzerland
M. Cattaneo European Organization for Nuclear Research (CERN), Geneva, Switzerland
Ch. Cauet Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany
M. Charles Department of Physics, University of Oxford, Oxford, United Kingdom
Ph. Charpentier European Organization for Nuclear Research (CERN), Geneva, Switzerland
P. Chen Center for High Energy Physics, Tsinghua University, Beijing, China Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
N. Chiapolini Physik-Institut, Universität Zürich, Zürich, Switzerland
M. Chrzaszcz Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland
K. Ciba European Organization for Nuclear Research (CERN), Geneva, Switzerland
X. Cid Vidal European Organization for Nuclear Research (CERN), Geneva, Switzerland
G. Ciezarek Imperial College London, London, United Kingdom
P. E. L. Clarke School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
M. Clemencic European Organization for Nuclear Research (CERN), Geneva, Switzerland
H. V. Cliff Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom
J. Closier European Organization for Nuclear Research (CERN), Geneva, Switzerland
C. Coca Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania
V. Coco Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands
J. Cogan CNRS/IN2P3, CPPM, Aix-Marseille Université, Marseille, France
E. Cogneras CNRS/IN2P3, LPC, Clermont Université, Université Blaise Pascal, Clermont-Ferrand, France
P. Collins European Organization for Nuclear Research (CERN), Geneva, Switzerland
A. Comerma-Montells Universitat de Barcelona, Barcelona, Spain
A. Contu Sezione INFN di Cagliari, Cagliari, Italy
A. Cook H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom
M. Coombes H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom
S. Coquereau LPNHE, Université Pierre et Marie Curie, Université Paris Diderot, CNRS/IN2P3, Paris, France
G. Corti European Organization for Nuclear Research (CERN), Geneva, Switzerland
B. Couturier European Organization for Nuclear Research (CERN), Geneva, Switzerland
G. A. Cowan School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
D. C. Craik Department of Physics, University of Warwick, Coventry, United Kingdom
S. Cunliffe Imperial College London, London, United Kingdom
R. Currie School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
C. D’Ambrosio European Organization for Nuclear Research (CERN), Geneva, Switzerland
P. David LPNHE, Université Pierre et Marie Curie, Université Paris Diderot, CNRS/IN2P3, Paris, France
P. N. Y. David Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands
A. Davis University of Cincinnati, Cincinnati, OH United States
I. De Bonis LAPP, Université de Savoie, CNRS/IN2P3, Annecy-Le-Vieux, France
K. De Bruyn Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands
S. De Capua School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom
M. De Cian Physik-Institut, Universität Zürich, Zürich, Switzerland
J. M. De Miranda Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil
L. De Paula Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
W. De Silva University of Cincinnati, Cincinnati, OH United States
P. De Simone Laboratori Nazionali dell’INFN di Frascati, Frascati, Italy
D. Decamp LAPP, Université de Savoie, CNRS/IN2P3, Annecy-Le-Vieux, France
M. Deckenhoff Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany
L. Del Buono LPNHE, Université Pierre et Marie Curie, Université Paris Diderot, CNRS/IN2P3, Paris, France
D. Derkach Sezione INFN di Bologna, Bologna, Italy
O. Deschamps CNRS/IN2P3, LPC, Clermont Université, Université Blaise Pascal, Clermont-Ferrand, France
F. Dettori Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, The Netherlands
A. Di Canto Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
H. Dijkstra European Organization for Nuclear Research (CERN), Geneva, Switzerland
M. Dogaru Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania
S. Donleavy Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom
F. Dordei Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
A. Dosil Suárez Universidad de Santiago de Compostela, Santiago de Compostela, Spain
D. Dossett Department of Physics, University of Warwick, Coventry, United Kingdom
A. Dovbnya NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine
F. Dupertuis Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
R. Dzhelyadin Institute for High Energy Physics (IHEP), Protvino, Russia
A. Dziurda Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland
A. Dzyuba Petersburg Nuclear Physics Institute (PNPI), Gatchina, Russia
S. Easo European Organization for Nuclear Research (CERN), Geneva, Switzerland STFC Rutherford Appleton Laboratory, Didcot, United Kingdom
U. Egede Imperial College London, London, United Kingdom
V. Egorychev Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia
S. Eidelman Budker Institute of Nuclear Physics (SB RAS) and Novosibirsk State University, Novosibirsk, Russia
D. van Eijk Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands
S. Eisenhardt School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
U. Eitschberger Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany
R. Ekelhof Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany
L. Eklund European Organization for Nuclear Research (CERN), Geneva, Switzerland School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom
I. El Rifai CNRS/IN2P3, LPC, Clermont Université, Université Blaise Pascal, Clermont-Ferrand, France
Ch. Elsasser Physik-Institut, Universität Zürich, Zürich, Switzerland
D. Elsby University of Birmingham, Birmingham, United Kingdom
A. Falabella Sezione INFN di Bologna, Bologna, Italy
C. Färber Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
G. Fardell School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
C. Farinelli Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands
S. Farry School of Physics, University College Dublin, Dublin, Ireland
V. Fave Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
D. Ferguson School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
V. Fernandez Albor Universidad de Santiago de Compostela, Santiago de Compostela, Spain
F. Ferreira Rodrigues Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil
M. Ferro-Luzzi European Organization for Nuclear Research (CERN), Geneva, Switzerland
S. Filippov Institute for Nuclear Research of the Russian Academy of Sciences (INR RAN), Moscow, Russia
M. Fiore Sezione INFN di Ferrara, Ferrara, Italy
C. Fitzpatrick European Organization for Nuclear Research (CERN), Geneva, Switzerland
M. Fontana Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany
F. Fontanelli Sezione INFN di Genova, Genova, Italy
R. Forty European Organization for Nuclear Research (CERN), Geneva, Switzerland
O. Francisco Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
M. Frank European Organization for Nuclear Research (CERN), Geneva, Switzerland
C. Frei European Organization for Nuclear Research (CERN), Geneva, Switzerland
M. Frosini Sezione INFN di Firenze, Firenze, Italy
S. Furcas Sezione INFN di Milano Bicocca, Milano, Italy
E. Furfaro Sezione INFN di Roma Tor Vergata, Roma, Italy
A. Gallas Torreira Universidad de Santiago de Compostela, Santiago de Compostela, Spain
D. Galli Sezione INFN di Bologna, Bologna, Italy
M. Gandelman Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
P. Gandini Syracuse University, Syracuse, NY United States
Y. Gao Center for High Energy Physics, Tsinghua University, Beijing, China
J. Garofoli Syracuse University, Syracuse, NY United States
P. Garosi School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom
J. Garra Tico Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom
L. Garrido Universitat de Barcelona, Barcelona, Spain
C. Gaspar European Organization for Nuclear Research (CERN), Geneva, Switzerland
R. Gauld Department of Physics, University of Oxford, Oxford, United Kingdom
E. Gersabeck Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
M. Gersabeck School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom
T. Gershon European Organization for Nuclear Research (CERN), Geneva, Switzerland Department of Physics, University of Warwick, Coventry, United Kingdom
Ph. Ghez LAPP, Université de Savoie, CNRS/IN2P3, Annecy-Le-Vieux, France
V. Gibson Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom
V. V. Gligorov European Organization for Nuclear Research (CERN), Geneva, Switzerland
C. Göbel Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro, Brazil
D. Golubkov Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia
A. Golutvin Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia European Organization for Nuclear Research (CERN), Geneva, Switzerland Imperial College London, London, United Kingdom
A. Gomes Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
H. Gordon Department of Physics, University of Oxford, Oxford, United Kingdom
C. Gotti Sezione INFN di Milano Bicocca, Milano, Italy
M. Grabalosa Gándara CNRS/IN2P3, LPC, Clermont Université, Université Blaise Pascal, Clermont-Ferrand, France
R. Graciani Diaz Universitat de Barcelona, Barcelona, Spain
L. A. Granado Cardoso European Organization for Nuclear Research (CERN), Geneva, Switzerland
E. Graugés Universitat de Barcelona, Barcelona, Spain
G. Graziani Sezione INFN di Firenze, Firenze, Italy
A. Grecu Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania
E. Greening Department of Physics, University of Oxford, Oxford, United Kingdom
S. Gregson Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom
O. Grünberg Institut für Physik, Universität Rostock, Rostock, Germany
B. Gui Syracuse University, Syracuse, NY United States
E. Gushchin Institute for Nuclear Research of the Russian Academy of Sciences (INR RAN), Moscow, Russia
Yu. Guz Institute for High Energy Physics (IHEP), Protvino, Russia European Organization for Nuclear Research (CERN), Geneva, Switzerland
T. Gys European Organization for Nuclear Research (CERN), Geneva, Switzerland
C. Hadjivasiliou Syracuse University, Syracuse, NY United States
G. Haefeli Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
C. Haen European Organization for Nuclear Research (CERN), Geneva, Switzerland
S. C. Haines Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom
S. Hall Imperial College London, London, United Kingdom
T. Hampson H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom
S. Hansmann-Menzemer Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
N. Harnew Department of Physics, University of Oxford, Oxford, United Kingdom
S. T. Harnew H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom
J. Harrison School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom
T. Hartmann Institut für Physik, Universität Rostock, Rostock, Germany
J. He European Organization for Nuclear Research (CERN), Geneva, Switzerland
V. Heijne Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands
K. Hennessy Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom
P. Henrard CNRS/IN2P3, LPC, Clermont Université, Université Blaise Pascal, Clermont-Ferrand, France
J. A. Hernando Morata Universidad de Santiago de Compostela, Santiago de Compostela, Spain
E. van Herwijnen European Organization for Nuclear Research (CERN), Geneva, Switzerland
A. Hicheur Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil
E. Hicks Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom
D. Hill Department of Physics, University of Oxford, Oxford, United Kingdom
M. Hoballah CNRS/IN2P3, LPC, Clermont Université, Université Blaise Pascal, Clermont-Ferrand, France
C. Hombach School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom
P. Hopchev LAPP, Université de Savoie, CNRS/IN2P3, Annecy-Le-Vieux, France
W. Hulsbergen Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands
P. Hunt Department of Physics, University of Oxford, Oxford, United Kingdom
T. Huse Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom
N. Hussain Department of Physics, University of Oxford, Oxford, United Kingdom
D. Hutchcroft Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom
D. Hynds School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom
V. Iakovenko Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine
M. Idzik Faculty of Physics and Applied Computer Science, AGH - University of Science and Technology, Kraków, Poland
P. Ilten School of Physics, University College Dublin, Dublin, Ireland
R. Jacobsson European Organization for Nuclear Research (CERN), Geneva, Switzerland
A. Jaeger Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
E. Jans Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands
P. Jaton Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
F. Jing Center for High Energy Physics, Tsinghua University, Beijing, China
M. John Department of Physics, University of Oxford, Oxford, United Kingdom
D. Johnson Department of Physics, University of Oxford, Oxford, United Kingdom
C. R. Jones Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom
C. Joram European Organization for Nuclear Research (CERN), Geneva, Switzerland
B. Jost European Organization for Nuclear Research (CERN), Geneva, Switzerland
M. Kaballo Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany
S. Kandybei NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine
M. Karacson European Organization for Nuclear Research (CERN), Geneva, Switzerland
T. M. Karbach European Organization for Nuclear Research (CERN), Geneva, Switzerland
I. R. Kenyon University of Birmingham, Birmingham, United Kingdom
U. Kerzel European Organization for Nuclear Research (CERN), Geneva, Switzerland
T. Ketel Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, The Netherlands
A. Keune Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
B. Khanji Sezione INFN di Milano Bicocca, Milano, Italy
O. Kochebina LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France
I. Komarov Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
R. F. Koopman Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, The Netherlands
P. Koppenburg Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands
M. Korolev Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia
A. Kozlinskiy Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands
L. Kravchuk Institute for Nuclear Research of the Russian Academy of Sciences (INR RAN), Moscow, Russia
K. Kreplin Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
M. Kreps Department of Physics, University of Warwick, Coventry, United Kingdom
G. Krocker Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
P. Krokovny Budker Institute of Nuclear Physics (SB RAS) and Novosibirsk State University, Novosibirsk, Russia
F. Kruse Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany
M. Kucharczyk Sezione INFN di Milano Bicocca, Milano, Italy Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland
V. Kudryavtsev Budker Institute of Nuclear Physics (SB RAS) and Novosibirsk State University, Novosibirsk, Russia
T. Kvaratskheliya Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia European Organization for Nuclear Research (CERN), Geneva, Switzerland
V. N. La Thi Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
D. Lacarrere European Organization for Nuclear Research (CERN), Geneva, Switzerland
G. Lafferty School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom
A. Lai Sezione INFN di Cagliari, Cagliari, Italy
D. Lambert School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
R. W. Lambert Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, The Netherlands
E. Lanciotti European Organization for Nuclear Research (CERN), Geneva, Switzerland
G. Lanfranchi Laboratori Nazionali dell’INFN di Frascati, Frascati, Italy European Organization for Nuclear Research (CERN), Geneva, Switzerland
C. Langenbruch European Organization for Nuclear Research (CERN), Geneva, Switzerland
T. Latham Department of Physics, University of Warwick, Coventry, United Kingdom
C. Lazzeroni University of Birmingham, Birmingham, United Kingdom
R. Le Gac CNRS/IN2P3, CPPM, Aix-Marseille Université, Marseille, France
J. van Leerdam Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands
J.-P. Lees LAPP, Université de Savoie, CNRS/IN2P3, Annecy-Le-Vieux, France
R. Lefèvre CNRS/IN2P3, LPC, Clermont Université, Université Blaise Pascal, Clermont-Ferrand, France
A. Leflat Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia
J. Lefrançois LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France
S. Leo Sezione INFN di Pisa, Pisa, Italy
O. Leroy CNRS/IN2P3, CPPM, Aix-Marseille Université, Marseille, France
T. Lesiak Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland
B. Leverington Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
Y. Li Center for High Energy Physics, Tsinghua University, Beijing, China
L. Li Gioi CNRS/IN2P3, LPC, Clermont Université, Université Blaise Pascal, Clermont-Ferrand, France
M. Liles Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom
R. Lindner European Organization for Nuclear Research (CERN), Geneva, Switzerland
C. Linn Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
B. Liu Center for High Energy Physics, Tsinghua University, Beijing, China
G. Liu European Organization for Nuclear Research (CERN), Geneva, Switzerland
S. Lohn European Organization for Nuclear Research (CERN), Geneva, Switzerland
I. Longstaff School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom
J. H. Lopes Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
E. Lopez Asamar Universitat de Barcelona, Barcelona, Spain
N. Lopez-March Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
H. Lu Center for High Energy Physics, Tsinghua University, Beijing, China
D. Lucchesi Sezione INFN di Padova, Padova, Italy
J. Luisier Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
H. Luo School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
F. Machefert LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France
I. V. Machikhiliyan LAPP, Université de Savoie, CNRS/IN2P3, Annecy-Le-Vieux, France Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia
F. Maciuc Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania
O. Maev Petersburg Nuclear Physics Institute (PNPI), Gatchina, Russia European Organization for Nuclear Research (CERN), Geneva, Switzerland
S. Malde Department of Physics, University of Oxford, Oxford, United Kingdom
G. Manca Sezione INFN di Cagliari, Cagliari, Italy
G. Mancinelli CNRS/IN2P3, CPPM, Aix-Marseille Université, Marseille, France
U. Marconi Sezione INFN di Bologna, Bologna, Italy
R. Märki Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
J. Marks Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
G. Martellotti Sezione INFN di Roma La Sapienza, Roma, Italy
A. Martens LPNHE, Université Pierre et Marie Curie, Université Paris Diderot, CNRS/IN2P3, Paris, France
A. Martín Sánchez LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France
M. Martinelli Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands
D. Martinez Santos Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, The Netherlands
D. Martins Tostes Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
A. Martynov Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia
A. Massafferri Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil
R. Matev European Organization for Nuclear Research (CERN), Geneva, Switzerland
Z. Mathe European Organization for Nuclear Research (CERN), Geneva, Switzerland
C. Matteuzzi Sezione INFN di Milano Bicocca, Milano, Italy
E. Maurice CNRS/IN2P3, CPPM, Aix-Marseille Université, Marseille, France
A. Mazurov Sezione INFN di Ferrara, Ferrara, Italy Institute for Nuclear Research of the Russian Academy of Sciences (INR RAN), Moscow, Russia European Organization for Nuclear Research (CERN), Geneva, Switzerland
J. McCarthy University of Birmingham, Birmingham, United Kingdom
A. McNab School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom
R. McNulty School of Physics, University College Dublin, Dublin, Ireland
B. Meadows Department of Physics, University of Oxford, Oxford, United Kingdom University of Cincinnati, Cincinnati, OH United States
F. Meier Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany
M. Meissner Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
M. Merk Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands
D. A. Milanes LPNHE, Université Pierre et Marie Curie, Université Paris Diderot, CNRS/IN2P3, Paris, France
M.-N. Minard LAPP, Université de Savoie, CNRS/IN2P3, Annecy-Le-Vieux, France
J. Molina Rodriguez Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro, Brazil
S. Monteil CNRS/IN2P3, LPC, Clermont Université, Université Blaise Pascal, Clermont-Ferrand, France
D. Moran School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom
P. Morawski Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland
M. J. Morello Sezione INFN di Pisa, Pisa, Italy
R. Mountain Syracuse University, Syracuse, NY United States
I. Mous Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands
F. Muheim School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
K. Müller Physik-Institut, Universität Zürich, Zürich, Switzerland
R. Muresan Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania
B. Muryn Faculty of Physics and Applied Computer Science, AGH - University of Science and Technology, Kraków, Poland
B. Muster Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
P. Naik H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom
T. Nakada Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
R. Nandakumar STFC Rutherford Appleton Laboratory, Didcot, United Kingdom
I. Nasteva Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil
M. Needham School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
N. Neufeld European Organization for Nuclear Research (CERN), Geneva, Switzerland
A. D. Nguyen Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
T. D. Nguyen Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
C. Nguyen-Mau Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
M. Nicol LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France
V. Niess CNRS/IN2P3, LPC, Clermont Université, Université Blaise Pascal, Clermont-Ferrand, France
R. Niet Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany
N. Nikitin Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia
T. Nikodem Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
A. Nomerotski Department of Physics, University of Oxford, Oxford, United Kingdom
A. Novoselov Institute for High Energy Physics (IHEP), Protvino, Russia
A. Oblakowska-Mucha Faculty of Physics and Applied Computer Science, AGH - University of Science and Technology, Kraków, Poland
V. Obraztsov Institute for High Energy Physics (IHEP), Protvino, Russia
S. Oggero Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands
S. Ogilvy School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom
O. Okhrimenko Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine
R. Oldeman Sezione INFN di Cagliari, Cagliari, Italy
M. Orlandea Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania
J. M. Otalora Goicochea Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
P. Owen Imperial College London, London, United Kingdom
A. Oyanguren Universitat de Barcelona, Barcelona, Spain
B. K. Pal Syracuse University, Syracuse, NY United States
A. Palano Sezione INFN di Bari, Bari, Italy
M. Palutan Laboratori Nazionali dell’INFN di Frascati, Frascati, Italy
J. Panman European Organization for Nuclear Research (CERN), Geneva, Switzerland
A. Papanestis STFC Rutherford Appleton Laboratory, Didcot, United Kingdom
M. Pappagallo School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom
C. Parkes School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom
C. J. Parkinson Imperial College London, London, United Kingdom
G. Passaleva Sezione INFN di Firenze, Firenze, Italy
G. D. Patel Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom
M. Patel Imperial College London, London, United Kingdom
G. N. Patrick STFC Rutherford Appleton Laboratory, Didcot, United Kingdom
C. Patrignani Sezione INFN di Genova, Genova, Italy
C. Pavel-Nicorescu Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania
A. Pazos Alvarez Universidad de Santiago de Compostela, Santiago de Compostela, Spain
A. Pellegrino Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands
G. Penso Sezione INFN di Roma La Sapienza, Roma, Italy
M. Pepe Altarelli European Organization for Nuclear Research (CERN), Geneva, Switzerland
S. Perazzini Sezione INFN di Bologna, Bologna, Italy
D. L. Perego Sezione INFN di Milano Bicocca, Milano, Italy
E. Perez Trigo Universidad de Santiago de Compostela, Santiago de Compostela, Spain
A. Pérez-Calero Yzquierdo Universitat de Barcelona, Barcelona, Spain
P. Perret CNRS/IN2P3, LPC, Clermont Université, Université Blaise Pascal, Clermont-Ferrand, France
M. Perrin-Terrin CNRS/IN2P3, CPPM, Aix-Marseille Université, Marseille, France
K. Petridis Imperial College London, London, United Kingdom
A. Petrolini Sezione INFN di Genova, Genova, Italy
A. Phan Syracuse University, Syracuse, NY United States
E. Picatoste Olloqui Universitat de Barcelona, Barcelona, Spain
B. Pietrzyk LAPP, Université de Savoie, CNRS/IN2P3, Annecy-Le-Vieux, France
T. Pilař Department of Physics, University of Warwick, Coventry, United Kingdom
D. Pinci Sezione INFN di Roma La Sapienza, Roma, Italy
S. Playfer School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
M. Plo Casasus Universidad de Santiago de Compostela, Santiago de Compostela, Spain
F. Polci LPNHE, Université Pierre et Marie Curie, Université Paris Diderot, CNRS/IN2P3, Paris, France
G. Polok Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland
A. Poluektov Budker Institute of Nuclear Physics (SB RAS) and Novosibirsk State University, Novosibirsk, Russia Department of Physics, University of Warwick, Coventry, United Kingdom
E. Polycarpo Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
D. Popov Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany
B. Popovici Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania
C. Potterat Universitat de Barcelona, Barcelona, Spain
A. Powell Department of Physics, University of Oxford, Oxford, United Kingdom
J. Prisciandaro Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
A. Pritchard Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom
C. Prouve LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France
V. Pugatch Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine
A. Puig Navarro Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
G. Punzi Sezione INFN di Pisa, Pisa, Italy
W. Qian LAPP, Université de Savoie, CNRS/IN2P3, Annecy-Le-Vieux, France
J. H. Rademacker H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom
B. Rakotomiaramanana Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
M. S. Rangel Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
I. Raniuk NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine
N. Rauschmayr European Organization for Nuclear Research (CERN), Geneva, Switzerland
G. Raven Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, The Netherlands
S. Redford Department of Physics, University of Oxford, Oxford, United Kingdom
M. M. Reid Department of Physics, University of Warwick, Coventry, United Kingdom
A. C. dos Reis Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil
S. Ricciardi STFC Rutherford Appleton Laboratory, Didcot, United Kingdom
A. Richards Imperial College London, London, United Kingdom
K. Rinnert Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom
V. Rives Molina Universitat de Barcelona, Barcelona, Spain
D. A. Roa Romero CNRS/IN2P3, LPC, Clermont Université, Université Blaise Pascal, Clermont-Ferrand, France
P. Robbe LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France
E. Rodrigues School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom
P. Rodriguez Perez Universidad de Santiago de Compostela, Santiago de Compostela, Spain
S. Roiser European Organization for Nuclear Research (CERN), Geneva, Switzerland
V. Romanovsky Institute for High Energy Physics (IHEP), Protvino, Russia
A. Romero Vidal Universidad de Santiago de Compostela, Santiago de Compostela, Spain
J. Rouvinet Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
T. Ruf European Organization for Nuclear Research (CERN), Geneva, Switzerland
F. Ruffini Sezione INFN di Pisa, Pisa, Italy
H. Ruiz Universitat de Barcelona, Barcelona, Spain
P. Ruiz Valls Universitat de Barcelona, Barcelona, Spain
G. Sabatino Sezione INFN di Roma La Sapienza, Roma, Italy
J. J. Saborido Silva Universidad de Santiago de Compostela, Santiago de Compostela, Spain
N. Sagidova Petersburg Nuclear Physics Institute (PNPI), Gatchina, Russia
P. Sail School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom
B. Saitta Sezione INFN di Cagliari, Cagliari, Italy
C. Salzmann Physik-Institut, Universität Zürich, Zürich, Switzerland
B. Sanmartin Sedes Universidad de Santiago de Compostela, Santiago de Compostela, Spain
M. Sannino Sezione INFN di Genova, Genova, Italy
R. Santacesaria Sezione INFN di Roma La Sapienza, Roma, Italy
C. Santamarina Rios Universidad de Santiago de Compostela, Santiago de Compostela, Spain
E. Santovetti Sezione INFN di Roma Tor Vergata, Roma, Italy
M. Sapunov CNRS/IN2P3, CPPM, Aix-Marseille Université, Marseille, France
A. Sarti Laboratori Nazionali dell’INFN di Frascati, Frascati, Italy
C. Satriano Sezione INFN di Roma La Sapienza, Roma, Italy
A. Satta Sezione INFN di Roma Tor Vergata, Roma, Italy
M. Savrie Sezione INFN di Ferrara, Ferrara, Italy
D. Savrina Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia
P. Schaack Imperial College London, London, United Kingdom
M. Schiller Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, The Netherlands
H. Schindler European Organization for Nuclear Research (CERN), Geneva, Switzerland
M. Schlupp Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany
M. Schmelling Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany
B. Schmidt European Organization for Nuclear Research (CERN), Geneva, Switzerland
O. Schneider Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
A. Schopper European Organization for Nuclear Research (CERN), Geneva, Switzerland
M.-H. Schune LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France
R. Schwemmer European Organization for Nuclear Research (CERN), Geneva, Switzerland
B. Sciascia Laboratori Nazionali dell’INFN di Frascati, Frascati, Italy
A. Sciubba Sezione INFN di Roma La Sapienza, Roma, Italy
M. Seco Universidad de Santiago de Compostela, Santiago de Compostela, Spain
A. Semennikov Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia
K. Senderowska Faculty of Physics and Applied Computer Science, AGH - University of Science and Technology, Kraków, Poland
I. Sepp Imperial College London, London, United Kingdom
N. Serra Physik-Institut, Universität Zürich, Zürich, Switzerland
J. Serrano CNRS/IN2P3, CPPM, Aix-Marseille Université, Marseille, France
P. Seyfert Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
M. Shapkin Institute for High Energy Physics (IHEP), Protvino, Russia
I. Shapoval Sezione INFN di Ferrara, Ferrara, Italy NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine
P. Shatalov Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia
Y. Shcheglov Petersburg Nuclear Physics Institute (PNPI), Gatchina, Russia
T. Shears European Organization for Nuclear Research (CERN), Geneva, Switzerland Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom
L. Shekhtman Budker Institute of Nuclear Physics (SB RAS) and Novosibirsk State University, Novosibirsk, Russia
O. Shevchenko NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine
V. Shevchenko Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia
A. Shires Imperial College London, London, United Kingdom
R. Silva Coutinho Department of Physics, University of Warwick, Coventry, United Kingdom
T. Skwarnicki Syracuse University, Syracuse, NY United States
N. A. Smith Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom
E. Smith STFC Rutherford Appleton Laboratory, Didcot, United Kingdom Department of Physics, University of Oxford, Oxford, United Kingdom
M. Smith School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom
M. D. Sokoloff University of Cincinnati, Cincinnati, OH United States
F. J. P. Soler School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom
F. Soomro Laboratori Nazionali dell’INFN di Frascati, Frascati, Italy
D. Souza H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom
B. Souza De Paula Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
B. Spaan Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany
A. Sparkes School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
P. Spradlin School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom
F. Stagni European Organization for Nuclear Research (CERN), Geneva, Switzerland
S. Stahl Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
O. Steinkamp Physik-Institut, Universität Zürich, Zürich, Switzerland
S. Stoica Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania
S. Stone Syracuse University, Syracuse, NY United States
B. Storaci Physik-Institut, Universität Zürich, Zürich, Switzerland
M. Straticiuc Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania
U. Straumann Physik-Institut, Universität Zürich, Zürich, Switzerland
V. K. Subbiah European Organization for Nuclear Research (CERN), Geneva, Switzerland
S. Swientek Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany
V. Syropoulos Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, The Netherlands
M. Szczekowski National Center for Nuclear Research (NCBJ), Warsaw, Poland
P. Szczypka European Organization for Nuclear Research (CERN), Geneva, Switzerland Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
T. Szumlak Faculty of Physics and Applied Computer Science, AGH - University of Science and Technology, Kraków, Poland
S. T’Jampens LAPP, Université de Savoie, CNRS/IN2P3, Annecy-Le-Vieux, France
M. Teklishyn LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France
E. Teodorescu Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania
F. Teubert European Organization for Nuclear Research (CERN), Geneva, Switzerland
C. Thomas Department of Physics, University of Oxford, Oxford, United Kingdom
E. Thomas European Organization for Nuclear Research (CERN), Geneva, Switzerland
J. van Tilburg Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
V. Tisserand LAPP, Université de Savoie, CNRS/IN2P3, Annecy-Le-Vieux, France
M. Tobin Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
S. Tolk Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, The Netherlands
D. Tonelli European Organization for Nuclear Research (CERN), Geneva, Switzerland
S. Topp-Joergensen Department of Physics, University of Oxford, Oxford, United Kingdom
N. Torr Department of Physics, University of Oxford, Oxford, United Kingdom
E. Tournefier LAPP, Université de Savoie, CNRS/IN2P3, Annecy-Le-Vieux, France Imperial College London, London, United Kingdom
S. Tourneur Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
M. T. Tran Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
M. Tresch Physik-Institut, Universität Zürich, Zürich, Switzerland
A. Tsaregorodtsev CNRS/IN2P3, CPPM, Aix-Marseille Université, Marseille, France
P. Tsopelas Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands
N. Tuning Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands
M. Ubeda Garcia European Organization for Nuclear Research (CERN), Geneva, Switzerland
A. Ukleja National Center for Nuclear Research (NCBJ), Warsaw, Poland
D. Urner School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom
U. Uwer Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
V. Vagnoni Sezione INFN di Bologna, Bologna, Italy
G. Valenti Sezione INFN di Bologna, Bologna, Italy
R. Vazquez Gomez Universitat de Barcelona, Barcelona, Spain
P. Vazquez Regueiro Universidad de Santiago de Compostela, Santiago de Compostela, Spain
S. Vecchi Sezione INFN di Ferrara, Ferrara, Italy
J. J. Velthuis H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom
M. Veltri Sezione INFN di Firenze, Firenze, Italy
G. Veneziano Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
M. Vesterinen European Organization for Nuclear Research (CERN), Geneva, Switzerland
B. Viaud LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France
D. Vieira Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
X. Vilasis-Cardona Universitat de Barcelona, Barcelona, Spain
A. Vollhardt Physik-Institut, Universität Zürich, Zürich, Switzerland
D. Volyanskyy Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany
D. Voong H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom
A. Vorobyev Petersburg Nuclear Physics Institute (PNPI), Gatchina, Russia
V. Vorobyev Budker Institute of Nuclear Physics (SB RAS) and Novosibirsk State University, Novosibirsk, Russia
C. Voß Institut für Physik, Universität Rostock, Rostock, Germany
H. Voss Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany
R. Waldi Institut für Physik, Universität Rostock, Rostock, Germany
R. Wallace School of Physics, University College Dublin, Dublin, Ireland
S. Wandernoth Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
J. Wang Syracuse University, Syracuse, NY United States
D. R. Ward Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom
N. K. Watson University of Birmingham, Birmingham, United Kingdom
A. D. Webber School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom
D. Websdale Imperial College London, London, United Kingdom
M. Whitehead Department of Physics, University of Warwick, Coventry, United Kingdom
J. Wicht European Organization for Nuclear Research (CERN), Geneva, Switzerland
J. Wiechczynski Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland
D. Wiedner Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
L. Wiggers Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands
G. Wilkinson Department of Physics, University of Oxford, Oxford, United Kingdom
M. P. Williams Department of Physics, University of Warwick, Coventry, United Kingdom STFC Rutherford Appleton Laboratory, Didcot, United Kingdom
M. Williams Massachusetts Institute of Technology, Cambridge, MA United States
F. F. Wilson STFC Rutherford Appleton Laboratory, Didcot, United Kingdom
J. Wishahi Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany
M. Witek Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland
S. A. Wotton Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom
S. Wright Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom
S. Wu Center for High Energy Physics, Tsinghua University, Beijing, China
K. Wyllie European Organization for Nuclear Research (CERN), Geneva, Switzerland
Y. Xie European Organization for Nuclear Research (CERN), Geneva, Switzerland School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
Z. Xing Syracuse University, Syracuse, NY United States
Z. Yang Center for High Energy Physics, Tsinghua University, Beijing, China
R. Young School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
X. Yuan Center for High Energy Physics, Tsinghua University, Beijing, China
O. Yushchenko Institute for High Energy Physics (IHEP), Protvino, Russia
M. Zangoli Sezione INFN di Bologna, Bologna, Italy
M. Zavertyaev Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany
F. Zhang Center for High Energy Physics, Tsinghua University, Beijing, China
L. Zhang Syracuse University, Syracuse, NY United States
W. C. Zhang School of Physics, University College Dublin, Dublin, Ireland
Y. Zhang Center for High Energy Physics, Tsinghua University, Beijing, China
A. Zhelezov Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
A. Zhokhov Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia
L. Zhong Center for High Energy Physics, Tsinghua University, Beijing, China
A. Zvyagin European Organization for Nuclear Research (CERN), Geneva, Switzerland

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Measurement of form-factor-independent observables in the decay B0→K(*0)μ(+)μ(-)

We present a measurement of form-factor-independent angular observables in the decay B(0)→K*(892)(0)μ(+)μ(-). The analysis is based on a data sample corresponding to an integrated luminosity of 1.0 fb(-1), collected by the LHCb experiment in pp collisions at a center-of-mass energy of 7 TeV. Four observables are measured in six bins of the dimuon invariant mass squared q² in the range 0.1<q²<19.0 GeV²/c(4). Agreement with recent theoretical predictions of the standard model is found for 23 of the 24 measurements. A local discrepancy, corresponding to 3.7 Gaussian standard deviations is observed in one q² bin for one of the observables. Considering the 24 measurements as independent, the probability to observe such a discrepancy, or larger, in one is 0.5%.

Measurement of the CP asymmetry in B(+)→K(+)μ(+)μ(-) decays

A measurement of the CP asymmetry in B(+)→K(+)μ(+)μ(-) decays is presented using pp collision data, corresponding to an integrated luminosity of 1.0 fb(-1), recorded by the LHCb experiment during 2011 at a center-of-mass energy of 7 TeV. The measurement is performed in seven bins of μ(+)μ(-) invariant mass squared in the range 0.05<q2<22.00 GeV2/c4, excluding the J/ψ and ψ(2S) resonance regions. Production and detection asymmetries are corrected for using the B(+)→J/ψK(+) decay as a control mode. Averaged over all the bins, the CP asymmetry is found to be A(CP)=0.000±0.033 (stat)±0.005 (syst)±0.007 (J/ψK), where the third uncertainty is due to the CP asymmetry of the control mode. This is consistent with the standard model prediction.

Search for the lepton-flavor-violating decays B(s)0→e(±)μ(∓) and B0→e(±)μ(∓)

A search for the lepton-flavor-violating decays B(s)0→e(±)μ(∓) and B0→e(±)μ(∓) is performed with a data sample, corresponding to an integrated luminosity of 1.0 fb(-1) of pp collisions at √s=7 TeV, collected by the LHCb experiment. The observed number of B(s)0→e(±)μ(∓) and B0→e(±)μ(∓) candidates is consistent with background expectations. Upper limits on the branching fractions of both decays are determined to be B(B(s)0→e(±)μ(∓))<1.1(1.4)×10(-8) and B(B0→e(±)μ(∓))<2.8(3.7)×10(-9) at 90% (95%) confidence level (C.L.). These limits are a factor of 20 lower than those set by previous experiments. Lower bounds on the Pati-Salam leptoquark masses are also calculated, M(LQ)(B(s)0→e(±)μ(∓))>101 TeV/c(2) and M(LQ)(B0→e(±)μ(∓))>126 TeV/c(2) at 95% C.L., and are a factor of 2 higher than the previous bounds.

Observation of a resonance in B+ → K+ μ+ μ- decays at low recoil

A broad peaking structure is observed in the dimuon spectrum of B+ → K+ μ+ μ- decays in the kinematic region where the kaon has a low recoil against the dimuon system. The structure is consistent with interference between the B+ → K+ μ+ μ- decay and a resonance and has a statistical significance exceeding six standard deviations. The mean and width of the resonance are measured to be 4191(-8)(+9)  MeV/c2 and 65(-16)(+22)  MeV/c2, respectively, where the uncertainties include statistical and systematic contributions. These measurements are compatible with the properties of the ψ(4160) meson. First observations of both the decay B+ → ψ(4160)K+ and the subsequent decay ψ(4160) → μ+ μ- are reported. The resonant decay and the interference contribution make up 20% of the yield for dimuon masses above 3770  MeV/c2. This contribution is larger than theoretical estimates.

Precision measurement of the Λb(0) baryon lifetime

The ratio of the Λb(0) baryon lifetime to that of the B(0) meson is measured using 1.0  fb(-1) of integrated luminosity in 7 TeV center-of-mass energy pp collisions at the LHC. The Λb(0) baryon is observed for the first time in the decay mode Λb(0)→J/ψpK-, while the B(0) meson decay used is the well known B(0)→J/ψπ+ K- mode, where the π+ K- mass is consistent with that of the K(*0)(892) meson. The ratio of lifetimes is measured to be 0.976±0.012±0.006, in agreement with theoretical expectations based on the heavy quark expansion. Using previous determinations of the B(0) meson lifetime, the Λb(0) lifetime is found to be 1.482±0.018±0.012  ps. In both cases, the first uncertainty is statistical and the second systematic.

Measurement of CP violation in the phase space of B±→K± π+ π- and B±→K± K+ K- decays

The charmless decays B±→K± π+ π- and B±→K± K+ K- are reconstructed using data, corresponding to an integrated luminosity of 1.0  fb(-1), collected by LHCb in 2011. The inclusive charge asymmetries of these modes are measured as ACP(B±→K± π+ π-)=0.032±0.008 (stat)±0.004 (syst)±0.007(J/ψK±) and ACP(B±→K± K+ K-)=-0.043±0.009 (stat)±0.003 (syst)±0.007(J/ψK±), where the third uncertainty is due to the CP asymmetry of the B±→J/ψK± reference mode. The significance of ACP(B±→K± K+ K-) exceeds three standard deviations and is the first evidence of an inclusive CP asymmetry in charmless three-body B decays. In addition to the inclusive CP asymmetries, larger asymmetries are observed in localized regions of phase space.

Measurement of the Bs(0)→μ+ μ- branching fraction and search for B(0)→μ+ μ- decays at the LHCb experiment

A search for the rare decays Bs(0)→μ+ μ- and B(0)→μ+ μ- is performed at the LHCb experiment. The data analyzed correspond to an integrated luminosity of 1  fb(-1) of pp collisions at a center-of-mass energy of 7 TeV and 2  fb(-1) at 8 TeV. An excess of Bs(0)→μ+ μ- signal candidates with respect to the background expectation is seen with a significance of 4.0 standard deviations. A time-integrated branching fraction of B(Bs(0)→μ+ μ-)=(2.9(-1.0)(+1.1))×10(-9) is obtained and an upper limit of B(B(0)→μ+ μ-)<7.4×10(-10) at 95% confidence level is set. These results are consistent with the standard model expectations.

Measurements of the branching fractions of [Formula: see text] decays

The branching fractions of the decay [Formula: see text] for different intermediate states are measured using data, corresponding to an integrated luminosity of 1.0 fb^-1, collected by the LHCb experiment. The total branching fraction, its charmless component [Formula: see text] and the branching fractions via the resonant [Formula: see text] states η_c (1S) and ψ(2S) relative to the decay via a J/ψ intermediate state are [Formula: see text] Upper limits on the B⁺ branching fractions into the η_c (2S) meson and into the charmonium-like states X(3872) and X(3915) are also obtained.

First observation of CP violation in the decays of B(s)0 mesons

Using pp collision data corresponding to an integrated luminosity of 1.0 fb(-1) and collected by LHCb in 2011 at a center-of-mass energy of 7 TeV, we report the measurement of direct CP violation in B(s)(0)→K(-)π(+) decays, A(CP)(B(s)(0)→K(-)π(+)=0.27±0.04 (stat)±0.01 (syst), with significance exceeding 5 standard deviations. This is the first observation of CP violation in the decays of B(s)(0) mesons. Furthermore, we provide an improved determination of direct CP violation in B(0)→K(+)π(-) decays, A(CP)(B(0)→K(+)π(-)=-0.080±0.007 (stat)±0.003 (syst), which is the most precise measurement of this quantity to date.

Determination of the X(3872) meson quantum numbers

The quantum numbers of the X(3872) meson are determined to be J(PC)=1(++) based on angular correlations in B(+)→X(3872)K(+) decays, where X(3872)→π(+)π(-)J/ψ and J/ψ→μ(+)μ(-). The data correspond to 1.0 fb(-1) of pp collisions collected by the LHCb detector. The only alternative assignment allowed by previous measurements J(PC)=2(-+) is rejected with a confidence level equivalent to more than 8 Gaussian standard deviations using a likelihood-ratio test in the full angular phase space. This result favors exotic explanations of the X(3872) state.

Search for rare B(0)((s))→μ(+)μ(-)μ(+)μ(-) decays

A search for the decays B(0)((s))→μ(+)μ(-)μ(+)μ(-) and B(0)→μ(+)μ(-)μ(+)μ(-) is performed using data, corresponding to an integrated luminosity of 1.0 fb(-1), collected with the LHCb detector in 2011. The number of candidates observed is consistent with the expected background and, assuming phase-space models of the decays, limits on the branching fractions are set: B(B(s)(0)→μ(+)μ(-)μ(+)μ(-))<1.6(1.2)×10(-8) and B(B(0)→μ(+)μ(-)μ(+)μ(-))<6.6(5.3)×10(-9) at 95% (90%) confidence level. In addition, limits are set in the context of a supersymmetric model which allows for the B((s))(0) meson to decay into a scalar (S) and pseudoscalar particle (P), where S and P have masses of 2.5 GeV/c and 214.3 MeV/c, respectively, both resonances decay into μ(+)μ(-). The branching fraction limits for these decays are B(B(s)(0)→SP)<1.6(1.2)×10(-8) and B(B(0)→SP)<6.3(5.1)×10(-9) at 95% (90%) confidence level.

Measurement of the forward energy flow in pp collisions at [Formula: see text]

The energy flow created in pp collisions at [Formula: see text] is studied within the pseudorapidity range 1.9<η<4.9 with data collected by the LHCb experiment. The measurements are performed for inclusive minimum-bias interactions, hard scattering processes and events with an enhanced or suppressed diffractive contribution. The results are compared to predictions given by Pythia-based and cosmic-ray event generators, which provide different models of soft hadronic interactions.

First observation of the decay Bs2*(5840)(0)→B*+ K- and studies of excited Bs(0) mesons

The properties of the orbitally excited (L=1) Bs(0) states are studied by using 1.0  fb(-1) of pp collisions at sqrt[s]=7  TeV collected with the LHCb detector. The first observation of the Bs2*(5840)(0) meson decaying to B*+ K- is reported, and the corresponding branching fraction measured relative to the B+ K- decay mode. The Bs1(5830)(0)→B*+ K- decay is observed as well. The width of the Bs2*(5840)(0) state is measured for the first time, and the masses of the two states are determined with the highest precision to date. The observation of the Bs2*(5840)(0)→B*+ K- decay favors the spin-parity assignment J(P)=2+ for the Bs2*(5840)(0) meson. In addition, the most precise measurement of the mass difference m(B*+)-m(B+)=45.01±0.30(stat)±0.23(syst)  MeV/c(2) is obtained.

First evidence for the decay B(s)(0)→μ+ μ-

A search for the rare decays B(s)(0)→μ+ μ- and B(0)→μ+ μ- is performed with data collected in 2011 and 2012 with the LHCb experiment at the Large Hadron Collider. The data samples comprise 1.1  fb(-1) of proton-proton collisions at sqrt[s]=8  TeV and 1.0  fb(-1) at sqrt[s]=7  TeV. We observe an excess of B(s)(0)→μ+ μ- candidates with respect to the background expectation. The probability that the background could produce such an excess or larger is 5.3×10(-4) corresponding to a signal significance of 3.5 standard deviations. A maximum-likelihood fit gives a branching fraction of B(B(s)(0)→μ+ μ-)=(3.2(-1.2)(+1.5))×10(-9), where the statistical uncertainty is 95% of the total uncertainty. This result is in agreement with the standard model expectation. The observed number of B(0)→μ+ μ- candidates is consistent with the background expectation, giving an upper limit of B(B(0)→μ+ μ-)<9.4×10(-10) at 95% confidence level.

Measurements of B(c)+ production and mass with the B(c)+ → J/ψπ+ decay

Measurements of B(c)(+) production and mass are performed with the decay mode B(c)(+)→J/ψπ(+) using 0.37 fb(-1) of data collected in pp collisions at √[s]=7 TeV by the LHCb experiment. The ratio of the production cross section times branching fraction between the B(c)(+)→J/ψπ(+) and the B(+)→J/ψK(+) decays is measured to be (0.68±0.10(stat)±0.03(syst)±0.05(lifetime))% for B(c)(+) and B(+) mesons with transverse momenta p(T)>4 GeV/c and pseudorapidities 2.5<η<4.5. The B(c)(+) mass is directly measured to be 6273.7±1.3(stat)±1.6(syst) MeV/c(2), and the measured mass difference with respect to the B(+) meson is M(B(c)(+))-M(B(+))=994.6±1.3(stat)±0.6(syst) MeV/c(2).

Observation of excited Λ(b)(0) baryons

Using pp collision data corresponding to 1.0 fb(-1) integrated luminosity collected by the LHCb detector, two narrow states are observed in the Λ(b)(0)π(+)π(-) spectrum with masses 5911.97±0.12(stat)±0.02(syst)±0.66(Λ(b)(0) mass) MeV/c(2) and 5919.77±0.08(stat)±0.02(syst)±0.66(Λ(b)(0) mass) MeV/c(2). The significances of the observations are 5.2 and 10.2 standard deviations, respectively. These states are interpreted as the orbitally excited Λ(b)(0) baryons, Λ(b)(*0)(5912) and Λ(b)(*0)(5920).

Measurement of the B¯(s)(0) effective lifetime in the J/ψf0(980) final state

The effective lifetime of the B ¯(s)(0) meson in the decay mode B¯(s)(0)→J/ψf(0)(980) is measured using 1.0 fb(-1) of data collected in pp collisions at √s=7 TeV with the LHCb detector. The result is 1.700±0.040±0.026 ps, where the first uncertainty is statistical and the second systematic. As the final state is CP-odd, and CP violation in this mode is measured to be small, the lifetime measurement can be translated into a measurement of the decay width of the heavy B¯(s)(0) mass eigenstate, Γ(H)=0.588±0.014±0.009 ps(-1).

Observation of B0→D¯(0)K(+)K(-) and evidence for B(s)(0)→D¯(0)K(+)K(-)

The first observation of the decay B0→D¯(0)K(+)K(-) is reported from an analysis of 0.62 fb(-1) of pp collision data collected with the LHCb detector. Its branching fraction is measured relative to that of the topologically similar decay B(0)→D ¯(0)π(+)π(-) to be (B(B(0)→D¯(0)K(+)K(-))/B(B(0)→D¯(0)π(+)π(-))=0.056±0.011±0.007,where the first uncertainty is statistical and the second is systematic. The significance of the signal is 5.8σ. Evidence, with 3.8σ significance, for B(s)(0)→D¯(0)K(+)K(-) decays is also presented. The relative branching fraction is measured to be B(B(s)(0)→D¯(0)K(+)K(-))/B(B(0)→D¯(0)K(+)K(-))=0.90±0.27±0.20. These channels are of interest to study the mechanisms behind hadronic B decays, and open new possibilities for CP violation analyses with larger data sets.

Measurement of relative branching fractions of B decays to ψ(2S) and J/ψ mesons

The relative rates of B-meson decays into J/ψ and ψ(2S) mesons are measured for the three decay modes in pp collisions recorded with the LHCb detector. The ratios of branching fractions ([Formula: see text]) are measured to be [Formula: see text] where the third uncertainty is from the ratio of the ψ(2S) and J/ψ branching fractions to μ⁺μ^-.