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Liu Y, Bailey JA, Bazavov A, Bernard C, Bouchard CM, DeTar C, Du D, El-Khadra AX, Freeland ED, Gámiz E, Gelzer Z, Gottlieb S, Heller UM, Kronfeld AS, Laiho J, Mackenzie PB, Meurice Y, Neil ET, Simone JN, Sugar R, Toussaint D, Van de Water RS, Zhou R. Bs → Kℓv form factors with 2+1 flavors. EPJ Web Conf 2018. [DOI: 10.1051/epjconf/201817513008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Using the MILC 2+1 flavor asqtad quark action ensembles, we are calculating the form factors f0 and f+ for the semileptonic Bs → Kℓv decay. A total of six ensembles with lattice spacing from ≈ 0.12 to 0.06 fm are being used. At the coarsest and finest lattice spacings, the light quark mass m’l is one-tenth the strange quark mass m’s. At the intermediate lattice spacing, the ratio m’l/m’s ranges from 0.05 to 0.2. The valence b quark is treated using the Sheikholeslami-Wohlert Wilson-clover action with the Fermilab interpretation. The other valence quarks use the asqtad action. When combined with (future) measurements from the LHCb and Belle II experiments, these calculations will provide an alternate determination of the CKM matrix element |Vub|.
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Bailey JA, Bazavov A, Bernard C, Bouchard CM, DeTar C, Du D, El-Khadra AX, Freeland ED, Gámiz E, Gottlieb S, Heller UM, Kronfeld AS, Laiho J, Levkova L, Liu Y, Lunghi E, Mackenzie PB, Meurice Y, Neil E, Qiu SW, Simone JN, Sugar R, Toussaint D, Van de Water RS, Zhou R. B→πll Form Factors for New Physics Searches from Lattice QCD. Phys Rev Lett 2015; 115:152002. [PMID: 26550717 DOI: 10.1103/physrevlett.115.152002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2015] [Indexed: 06/05/2023]
Abstract
The rare decay B→πℓ^{+}ℓ^{-} arises from b→d flavor-changing neutral currents and could be sensitive to physics beyond the standard model. Here, we present the first ab initio QCD calculation of the B→π tensor form factor f_{T}. Together with the vector and scalar form factors f_{+} and f_{0} from our companion work [J. A. Bailey et al., Phys. Rev. D 92, 014024 (2015)], these parametrize the hadronic contribution to B→π semileptonic decays in any extension of the standard model. We obtain the total branching ratio BR(B^{+}→π^{+}μ^{+}μ^{-})=20.4(2.1)×10^{-9} in the standard model, which is the most precise theoretical determination to date, and agrees with the recent measurement from the LHCb experiment [R. Aaij et al., J. High Energy Phys. 12 (2012) 125].
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Affiliation(s)
- Jon A Bailey
- Department of Physics and Astronomy, Seoul National University, Seoul 08826, South Korea
| | - A Bazavov
- Department of Physics and Astronomy, University of Iowa, Iowa City, Iowa 52242, USA
| | - C Bernard
- Department of Physics, Washington University, St. Louis, Missouri 63130, USA
| | - C M Bouchard
- Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA
| | - C DeTar
- Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112, USA
| | - Daping Du
- Department of Physics, Syracuse University, Syracuse, New York 13244, USA
| | - A X El-Khadra
- Department of Physics, University of Illinois, Urbana, Illinois 61801, USA
| | - E D Freeland
- Liberal Arts Department, School of the Art Institute of Chicago, Chicago, Illinois 60603, USA
| | - E Gámiz
- CAFPE and Departamento de Fisica Teórica y del Cosmos, Universidad de Granada, E-18002 Granada, Spain
| | - Steven Gottlieb
- Department of Physics, Indiana University, Bloomington, Indiana 47405, USA
| | - U M Heller
- American Physical Society, Ridge, New York 11961, USA
| | - A S Kronfeld
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
- Institute for Advanced Study, Technische Universität München, 85748 Garching, Germany
| | - J Laiho
- Department of Physics, Syracuse University, Syracuse, New York 13244, USA
| | - L Levkova
- Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112, USA
| | - Yuzhi Liu
- Department of Physics, University of Colorado, Boulder, Colorado 80309, USA
| | - E Lunghi
- Department of Physics, Indiana University, Bloomington, Indiana 47405, USA
| | - P B Mackenzie
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | - Y Meurice
- Department of Physics and Astronomy, University of Iowa, Iowa City, Iowa 52242, USA
| | - E Neil
- Department of Physics, University of Colorado, Boulder, Colorado 80309, USA
- RIKEN-BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - Si-Wei Qiu
- Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112, USA
| | - J N Simone
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | - R Sugar
- Department of Physics, University of California, Santa Barbara, California 93106, USA
| | - D Toussaint
- Physics Department, University of Arizona, Tucson, Arizona 85721, USA
| | - R S Van de Water
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | - Ran Zhou
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
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Bazavov A, Bernard C, Bouchard CM, Detar C, Du D, El-Khadra AX, Foley J, Freeland ED, Gámiz E, Gottlieb S, Heller UM, Kim J, Kronfeld AS, Laiho J, Levkova L, Mackenzie PB, Neil ET, Oktay MB, Qiu SW, Simone JN, Sugar R, Toussaint D, Van de Water RS, Zhou R. Determination of |V(us)|| from a lattice QCD calculation of the K → πℓν semileptonic form factor with physical quark masses. Phys Rev Lett 2014; 112:112001. [PMID: 24702353 DOI: 10.1103/physrevlett.112.112001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2013] [Indexed: 06/03/2023]
Abstract
We calculate the kaon semileptonic form factor f+(0) from lattice QCD, working, for the first time, at the physical light-quark masses. We use gauge configurations generated by the MILC Collaboration with Nf = 2 + 1 + 1 flavors of sea quarks, which incorporate the effects of dynamical charm quarks as well as those of up, down, and strange. We employ data at three lattice spacings to extrapolate to the continuum limit. Our result, f+(0) = 0.9704(32), where the error is the total statistical plus systematic uncertainty added in quadrature, is the most precise determination to date. Combining our result with the latest experimental measurements of K semileptonic decays, one obtains the Cabibbo-Kobayashi-Maskawa matrix element |V(us)| = 0.22290(74)(52), where the first error is from f+(0) and the second one is from experiment. In the first-row test of Cabibbo-Kobayashi-Maskawa unitarity, the error stemming from |V(us)| is now comparable to that from |V(ud)|.
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Affiliation(s)
- A Bazavov
- Physics Department, Brookhaven National Laboratory, Upton, New York 11973, USA and Department of Physics and Astronomy, University of Iowa, Iowa 52242, USA
| | - C Bernard
- Department of Physics, Washington University, St. Louis, Missouri 63130, USA
| | - C M Bouchard
- Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA
| | - C Detar
- Physics Department, University of Utah, Salt Lake City, Utah 84112, USA
| | - Daping Du
- Physics Department, University of Illinois, Urbana, Illinois 61801, USA
| | - A X El-Khadra
- Physics Department, University of Illinois, Urbana, Illinois 61801, USA and Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | - J Foley
- Physics Department, University of Utah, Salt Lake City, Utah 84112, USA
| | - E D Freeland
- Liberal Arts Department, School of the Art Institute of Chicago, Chicago, Illinois 60603, USA
| | - E Gámiz
- CAFPE and Departamento de Física Teórica y del Cosmos, Universidad de Granada, E-18071 Granada, Spain
| | - Steven Gottlieb
- Department of Physics, Indiana University, Bloomington, Indiana 47405, USA
| | - U M Heller
- American Physical Society, Ridge, New York 11961, USA
| | - Jongjeong Kim
- Department of Physics, University of Arizona, Tucson, Arizona 85721, USA
| | - A S Kronfeld
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | - J Laiho
- SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom and Department of Physics, Syracuse University, Syracuse, New York 13244, USA
| | - L Levkova
- Physics Department, University of Utah, Salt Lake City, Utah 84112, USA
| | - P B Mackenzie
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | - E T Neil
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA and Department of Physics, University of Colorado, Boulder, Colorado 80309, USA and RIKEN-BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - M B Oktay
- Physics Department, University of Utah, Salt Lake City, Utah 84112, USA
| | - Si-Wei Qiu
- Physics Department, University of Utah, Salt Lake City, Utah 84112, USA
| | - J N Simone
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | - R Sugar
- Department of Physics, University of California, Santa Barbara, California 93106, USA
| | - D Toussaint
- Department of Physics, University of Arizona, Tucson, Arizona 85721, USA
| | - R S Van de Water
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | - Ran Zhou
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA and Department of Physics, Indiana University, Bloomington, Indiana 47405, USA
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Bailey JA, Bazavov A, Bernard C, Bouchard CM, Detar C, Du D, El-Khadra AX, Foley J, Freeland ED, Gámiz E, Gottlieb S, Heller UM, Kim J, Kronfeld AS, Laiho J, Levkova L, Mackenzie PB, Meurice Y, Neil ET, Oktay MB, Qiu SW, Simone JN, Sugar R, Toussaint D, Van de Water RS, Zhou R. Refining new-physics searches in B→Dτν with lattice QCD. Phys Rev Lett 2012; 109:071802. [PMID: 23006357 DOI: 10.1103/physrevlett.109.071802] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2012] [Indexed: 06/01/2023]
Abstract
The semileptonic decay channel B→Dτν is sensitive to the presence of a scalar current, such as that mediated by a charged-Higgs boson. Recently, the BABAR experiment reported the first observation of the exclusive semileptonic decay B→Dτ(-)ν, finding an approximately 2σ disagreement with the standard-model prediction for the ratio R(D)=BR(B→Dτν)/BR(B→Dℓν), where ℓ = e,μ. We compute this ratio of branching fractions using hadronic form factors computed in unquenched lattice QCD and obtain R(D)=0.316(12)(7), where the errors are statistical and total systematic, respectively. This result is the first standard-model calculation of R(D) from ab initio full QCD. Its error is smaller than that of previous estimates, primarily due to the reduced uncertainty in the scalar form factor f(0)(q(2)). Our determination of R(D) is approximately 1σ higher than previous estimates and, thus, reduces the tension with experiment. We also compute R(D) in models with electrically charged scalar exchange, such as the type-II two-Higgs-doublet model. Once again, our result is consistent with, but approximately 1σ higher than, previous estimates for phenomenologically relevant values of the scalar coupling in the type-II model. As a by-product of our calculation, we also present the standard-model prediction for the longitudinal-polarization ratio P(L)(D)=0.325(4)(3).
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Affiliation(s)
- Jon A Bailey
- Department of Physics and Astronomy, Seoul National University, South Korea
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Aubin C, Bernard C, Detar C, Di Pierro M, Freeland ED, Gottlieb S, Heller UM, Hetrick JE, El-Khadra AX, Kronfeld AS, Levkova L, Mackenzie PB, Menscher D, Maresca F, Nobes M, Okamoto M, Renner D, Simone J, Sugar R, Toussaint D, Trottier HD. Charmed-meson decay constants in three-flavor lattice QCD. Phys Rev Lett 2005; 95:122002. [PMID: 16197067 DOI: 10.1103/physrevlett.95.122002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2005] [Indexed: 05/04/2023]
Abstract
We present the first lattice QCD calculation with realistic sea quark content of the D+-meson decay constant f(D+). We use the MILC Collaboration's publicly available ensembles of lattice gauge fields, which have a quark sea with two flavors (up and down) much lighter than a third (strange). We obtain f(D+)=201+/-3+/-17 MeV, where the errors are statistical and a combination of systematic errors. We also obtain f(Ds)=249+/-3+/-16 MeV for the Ds meson.
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Affiliation(s)
- C Aubin
- Physics Department, Columbia University, New York, New York 10027, USA
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