Nucleon scalar and tensor charges using lattice QCD simulations at the physical value of the pion mass
Autor: | Alexandrou, Constantia, Constantinou, Martha, Dimopoulos, Petros, Frezzotti, R., Hadjiyiannakou, Kyriakos, Jansen, K., Kallidonis, Christos, Kostrzewa, B., Koutsou, Giannis, Mangin-Brinet, M., Vaquero Avilès-Casco, A., Wenger, U. |
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Přispěvatelé: | Alexandrou, Constantia [0000-0001-9136-3621], Kallidonis, Christos [0000-0002-7734-0789], Dimopoulos, Petros [0000-0002-8660-714X], Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Laboratoire de Physique Subatomique et de Cosmologie ( LPSC ), Université Joseph Fourier - Grenoble 1 ( UJF ) -Institut polytechnique de Grenoble - Grenoble Institute of Technology ( Grenoble INP ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique ( CNRS ) -Université Grenoble Alpes ( UGA ) |
Jazyk: | angličtina |
Rok vydání: | 2017 |
Předmět: |
Nuclear Theory
Isoscalar 01 natural sciences 12.38.Aw High Energy Physics - Phenomenology (hep-ph) excited state nucleon: charm ground state [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex] Nuclear Experiment (nucl-ex) renormalization: nonperturbative quark: mass dependence Nuclear Experiment [ PHYS.NUCL ] Physics [physics]/Nuclear Theory [nucl-th] Quantum chromodynamics Physics charge: scalar High Energy Physics - Lattice (hep-lat) 12.38.-t lattice field theory [ PHYS.HLAT ] Physics [physics]/High Energy Physics - Lattice [hep-lat] Lattice QCD Settore FIS/02 - Fisica Teorica Modelli e Metodi Matematici error: statistical High Energy Physics - Phenomenology Quantum electrodynamics Nucleon quark: Wilson Particle physics [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th] 530 Physics Lattice field theory isovector FOS: Physical sciences nucleon: charge 12.38.Gc [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] fermion: clover Nuclear Theory (nucl-th) High Energy Physics - Lattice isoscalar quark: flavor: 2 0103 physical sciences quantum chromodynamics nucleon: strangeness ddc:530 Tensor 010306 general physics numerical calculations Isovector 010308 nuclear & particles physics [PHYS.HLAT]Physics [physics]/High Energy Physics - Lattice [hep-lat] Scalar (physics) quark: mass: twist 14.70.Dj [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph] 11.15.Ha [ PHYS.HPHE ] Physics [physics]/High Energy Physics - Phenomenology [hep-ph] charge: tensor |
Zdroj: | Physical review / D 95(11), 114514 (2017). doi:10.1103/PhysRevD.95.114514 Physical Review D Phy.Rev.D Phys.Rev.D Phys.Rev.D, 2017, 95 (11), pp.114514. ⟨10.1103/PhysRevD.95.114514⟩ Physical Review D, American Physical Society, 2017, 95 (11), pp.114514. ⟨10.1103/PhysRevD.95.114514⟩ Phys.Rev.D, 2017, 95 (11), pp.114514. 〈10.1103/PhysRevD.95.114514〉 |
ISSN: | 1550-7998 1550-2368 |
DOI: | 10.1103/PhysRevD.95.114514 |
Popis: | Physical review / D 95(11), 114514(2017). doi:10.1103/PhysRevD.95.114514 We present results on the light, strange and charm nucleon scalar and tensor charges from lattice QCD, using simulations with $N_f$ = 2 flavors of twisted mass clover-improved fermions with a physical value of the pion mass. Both connected and disconnected contributions are included, enabling us to extract the isoscalar, strange and charm charges for the first time directly at the physical point. Furthermore, the renormalization is computed nonperturbatively for both isovector and isoscalar quantities. We investigate excited state effects by analyzing several sink-source time separations and by employing a set of methods to probe ground state dominance. Our final results for the scalar charges are $g^{u}_{S} =$ 5.20(42)(15)(12), $g^{d}_{S} =$ 4.27(26)(15)(12), $g^{s}_{S} =$ 0.33(7)(1)(4), and $g^{c}_{S} =$ 0.062(13)(3)(5) and for the tensor charges $g^{c}_{T} =$ 0.794(16)(2)(13), $g^{d}_{T} =$ −0.210(10)(2)(13), $g^{s}_{T} =$ 0.00032(24)(0), and $g^{c}_{T} =$ 0.00062(85)(0) in the $\overline{MS}$ scheme at 2 GeV. The first error is statistical, the second is the systematic error due to the renormalization and the third the systematic arising from estimating the contamination due to the excited states, when our data are precise enough to probe the first excited state. Published by APS, Woodbury, NY |
Databáze: | OpenAIRE |
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