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Agadjanov A, Djukanovic D, von Hippel G, Meyer HB, Ottnad K, Wittig H. Nucleon Sigma Terms with N_{f}=2+1 Flavors of O(a)-Improved Wilson Fermions. Phys Rev Lett 2023; 131:261902. [PMID: 38215372 DOI: 10.1103/physrevlett.131.261902] [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: 03/22/2023] [Revised: 10/16/2023] [Accepted: 11/16/2023] [Indexed: 01/14/2024]
Abstract
We present a lattice-QCD based analysis of the nucleon sigma terms using gauge ensembles with N_{f}=2+1 flavors of O(a)-improved Wilson fermions, with a complete error budget concerning excited-state contaminations, the chiral interpolation as well as finite-size and lattice spacing effects. We compute the sigma terms determined directly from the matrix elements of the scalar currents. The chiral interpolation is based on SU(3) baryon chiral perturbation theory using the extended on-mass shell renormalization scheme. For the pion nucleon sigma term, we obtain σ_{πN}=(43.7±3.6) MeV, where the error includes our estimate of the aforementioned systematics. The tension with extractions based on dispersion theory persists at the 2.4-σ level. For the strange sigma term, we obtain a nonzero value, σ_{s}=(28.6±9.3) MeV.
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Affiliation(s)
- A Agadjanov
- PRISMA+ Cluster of Excellence and Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, D-55099 Mainz, Germany
| | - D Djukanovic
- Helmholtz Institute Mainz, Staudingerweg 18, D-55128 Mainz, Germany
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
| | - G von Hippel
- PRISMA+ Cluster of Excellence and Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, D-55099 Mainz, Germany
| | - H B Meyer
- PRISMA+ Cluster of Excellence and Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, D-55099 Mainz, Germany
- Helmholtz Institute Mainz, Staudingerweg 18, D-55128 Mainz, Germany
| | - K Ottnad
- PRISMA+ Cluster of Excellence and Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, D-55099 Mainz, Germany
| | - H Wittig
- PRISMA+ Cluster of Excellence and Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, D-55099 Mainz, Germany
- Helmholtz Institute Mainz, Staudingerweg 18, D-55128 Mainz, Germany
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Delaunay C, Karr JP, Kitahara T, Koelemeij JCJ, Soreq Y, Zupan J. Self-Consistent Extraction of Spectroscopic Bounds on Light New Physics. Phys Rev Lett 2023; 130:121801. [PMID: 37027868 DOI: 10.1103/physrevlett.130.121801] [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: 10/31/2022] [Accepted: 03/03/2023] [Indexed: 06/19/2023]
Abstract
Fundamental physical constants are determined from a collection of precision measurements of elementary particles, atoms, and molecules. This is usually done under the assumption of the standard model (SM) of particle physics. Allowing for light new physics (NP) beyond the SM modifies the extraction of fundamental physical constants. Consequently, setting NP bounds using these data, and at the same time assuming the Committee on Data of the International Science Council recommended values for the fundamental physical constants, is not reliable. As we show in this Letter, both SM and NP parameters can be simultaneously determined in a consistent way from a global fit. For light vectors with QED-like couplings, such as the dark photon, we provide a prescription that recovers the degeneracy with the photon in the massless limit and requires calculations only at leading order in the small new physics couplings. At present, the data show tensions partially related to the proton charge radius determination. We show that these can be alleviated by including contributions from a light scalar with flavor nonuniversal couplings.
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Affiliation(s)
- Cédric Delaunay
- Laboratoire d'Annecy-le-Vieux de Physique Théorique, CNRS-USMB, BP 110 Annecy-le-Vieux, F-74941 Annecy, France
- Theoretical Physics Department, CERN, Esplanade des Particules 1, Geneva CH-1211, Switzerland
| | - Jean-Philippe Karr
- Laboratoire Kastler Brossel, Sorbonne Université, CNRS, ENS-Université PSL, Collège de France, 4 place Jussieu, F-75005 Paris, France
- Université d'Evry-Val d'Essonne, Université Paris-Saclay, Boulevard François Mitterrand, F-91000 Evry, France
| | - Teppei Kitahara
- Institute for Advanced Research and Kobayashi-Maskawa Institute for the Origin of Particles and the Universe, Nagoya University, Nagoya 464-8602, Japan
- KEK Theory Center, IPNS, KEK, Tsukuba 305-0801, Japan
- CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Jeroen C J Koelemeij
- LaserLaB, Department of Physics and Astronomy, Vrije Universiteit Amsterdam, De Boelelaan 1081, 1081 HV Amsterdam, Netherlands
| | - Yotam Soreq
- Physics Department, Technion-Israel Institute of Technology, Haifa 3200003, Israel
| | - Jure Zupan
- Department of Physics, University of Cincinnati, Cincinnati, Ohio 45221,USA
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Gupta R, Park S, Hoferichter M, Mereghetti E, Yoon B, Bhattacharya T. Pion-Nucleon Sigma Term from Lattice QCD. Phys Rev Lett 2021; 127:242002. [PMID: 34951792 DOI: 10.1103/physrevlett.127.242002] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Revised: 10/18/2021] [Accepted: 10/27/2021] [Indexed: 06/14/2023]
Abstract
We present an analysis of the pion-nucleon σ-term σ_{πN} using six ensembles with 2+1+1-flavor highly improved staggered quark action generated by the MILC Collaboration. The most serious systematic effect in lattice calculations of nucleon correlation functions is the contribution of excited states. We estimate these using chiral perturbation theory (χPT) and show that the leading contribution to the isoscalar scalar charge comes from Nπ and Nππ states. Therefore, we carry out two analyses of lattice data to remove excited-state contamination, the standard one and a new one including Nπ and Nππ states. We find that the standard analysis gives σ_{πN}=41.9(4.9) MeV, consistent with previous lattice calculations, while our preferred χPT-motivated analysis gives σ_{πN}=59.6(7.4) MeV, which is consistent with phenomenological values obtained using πN scattering data. Our data on one physical pion mass ensemble were crucial for exposing this difference, therefore, calculations on additional physical mass ensembles are needed to confirm our result and resolve the tension between lattice QCD and phenomenology.
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Affiliation(s)
- Rajan Gupta
- Los Alamos National Laboratory, Theoretical Division T-2, Los Alamos, New Mexico 87545, USA
| | - Sungwoo Park
- Los Alamos National Laboratory, Theoretical Division T-2, Los Alamos, New Mexico 87545, USA
- Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - Martin Hoferichter
- Albert Einstein Center for Fundamental Physics, Institute for Theoretical Physics, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland
| | - Emanuele Mereghetti
- Los Alamos National Laboratory, Theoretical Division T-2, Los Alamos, New Mexico 87545, USA
| | - Boram Yoon
- Los Alamos National Laboratory, Computer, Computational, and Statistical Sciences Division CCS-7, Los Alamos, New Mexico 87545, USA
| | - Tanmoy Bhattacharya
- Los Alamos National Laboratory, Theoretical Division T-2, Los Alamos, New Mexico 87545, USA
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Alexandrou C, Bacchio S, Constantinou M, Finkenrath J, Hadjiyiannakou K, Jansen K, Koutsou G, Aviles-Casco AV. Nucleon axial, tensor, and scalar charges and
σ
-terms in lattice QCD. Int J Clin Exp Med 2020. [DOI: 10.1103/physrevd.102.054517] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Hoferichter M, Klos P, Menéndez J, Schwenk A. Improved Limits for Higgs-Portal Dark Matter from LHC Searches. Phys Rev Lett 2017; 119:181803. [PMID: 29219546 DOI: 10.1103/physrevlett.119.181803] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2017] [Indexed: 06/07/2023]
Abstract
Searches for invisible Higgs decays at the Large Hadron Collider constrain dark matter Higgs-portal models, where dark matter interacts with the standard model fields via the Higgs boson. While these searches complement dark matter direct-detection experiments, a comparison of the two limits depends on the coupling of the Higgs boson to the nucleons forming the direct-detection nuclear target, typically parametrized in a single quantity f_{N}. We evaluate f_{N} using recent phenomenological and lattice-QCD calculations, and include for the first time the coupling of the Higgs boson to two nucleons via pion-exchange currents. We observe a partial cancellation for Higgs-portal models that makes the two-nucleon contribution anomalously small. Our results, summarized as f_{N}=0.308(18), show that the uncertainty of the Higgs-nucleon coupling has been vastly overestimated in the past. The improved limits highlight that state-of-the-art nuclear physics input is key to fully exploiting experimental searches.
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Affiliation(s)
- Martin Hoferichter
- Institute for Nuclear Theory, University of Washington, Seattle, Washington 98195-1550, USA
| | - Philipp Klos
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - Javier Menéndez
- Center for Nuclear Study, The University of Tokyo, 113-0033 Tokyo, Japan
| | - Achim Schwenk
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
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Meißner UG, Ruiz de Elvira J, Hoferichter M, Kubis B. Roy–Steiner-equation analysis of pion–nucleon scattering. EPJ Web Conf 2017. [DOI: 10.1051/epjconf/201713701014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Abdel-Rehim A, Alexandrou C, Constantinou M, Hadjiyiannakou K, Jansen K, Kallidonis C, Koutsou G, Avilés-Casco AV. Direct Evaluation of the Quark Content of Nucleons from Lattice QCD at the Physical Point. Phys Rev Lett 2016; 116:252001. [PMID: 27391717 DOI: 10.1103/physrevlett.116.252001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2016] [Indexed: 06/06/2023]
Abstract
We evaluate the light, strange, and charm scalar content of the nucleon using one lattice QCD ensemble generated with two degenerate light quarks with mass fixed to their physical value. We use improved techniques to evaluate the disconnected quark loops to sufficient accuracy to determine the strange and charm nucleon σ terms in addition to the light quark content σ_{πN}. We find σ_{πN}=37.2(2.6)(4.7/2.9) MeV, σ_{s}=41.1(8.2)(7.8/5.8) MeV, and σ_{c}=79(21)(12/8) MeV, where the first error is statistical and the second is the systematic error due to the determination of the lattice spacing, the assessment of finite volume, and residual excited state effects.
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Affiliation(s)
- A Abdel-Rehim
- Computation-based Science and Technology Research Center, The Cyprus Institute, 20 Kavafi Street, Nicosia 2121, Cyprus
| | - C Alexandrou
- Computation-based Science and Technology Research Center, The Cyprus Institute, 20 Kavafi Street, Nicosia 2121, Cyprus
- Department of Physics, University of Cyprus, P.O. Box 20537, 1678 Nicosia, Cyprus
| | - M Constantinou
- Computation-based Science and Technology Research Center, The Cyprus Institute, 20 Kavafi Street, Nicosia 2121, Cyprus
| | - K Hadjiyiannakou
- Computation-based Science and Technology Research Center, The Cyprus Institute, 20 Kavafi Street, Nicosia 2121, Cyprus
- Department of Physics, University of Cyprus, P.O. Box 20537, 1678 Nicosia, Cyprus
| | - K Jansen
- NIC, DESY, Platanenallee 6, D-15738 Zeuthen, Germany
| | - Ch Kallidonis
- Computation-based Science and Technology Research Center, The Cyprus Institute, 20 Kavafi Street, Nicosia 2121, Cyprus
| | - G Koutsou
- Computation-based Science and Technology Research Center, The Cyprus Institute, 20 Kavafi Street, Nicosia 2121, Cyprus
| | - A Vaquero Avilés-Casco
- INFN Sezione di Milano-Bicocca, Edificio U2, Piazza della Scienza 3, 20126 Milano, Italy
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Kubis B, Hoferichter M, de Elvira JR, Meißner UG. Pion–nucleon scattering: from chiral perturbation theory to Roy–Steiner equations. EPJ Web Conf 2016. [DOI: 10.1051/epjconf/201613001006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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