Axial, scalar, and tensor charges of the nucleon from -flavor lattice QCD
Abstract
Here, we present results for the isovector axial, scalar, and tensor charges gu–dA, gu–dS, and gu–dT of the nucleon needed to probe the Standard Model and novel physics. The axial charge is a fundamental parameter describing the weak interactions of nucleons. The scalar and tensor charges probe novel interactions at the TeV scale in neutron and nuclear β-decays, and the flavor-diagonal tensor charges guT, gdT, and gsT are needed to quantify the contribution of the quark electric dipole moment (EDM) to the neutron EDM. The lattice-QCD calculations were done using nine ensembles of gauge configurations generated by the MILC Collaboration using the highly improved staggered quarks action with 2+1+1 dynamical flavors. These ensembles span three lattice spacings a ≈ 0.06,0.09, and 0.12 fm and light-quark masses corresponding to the pion masses Mπ ≈ 135, 225, and 315 MeV. High-statistics estimates on five ensembles using the all-mode-averaging method allow us to quantify all systematic uncertainties and perform a simultaneous extrapolation in the lattice spacing, lattice volume, and light-quark masses for the connected contributions. Our final estimates, in the ¯MS scheme at 2 GeV, of the isovector charges are gu–dA = 1.195(33)(20), gu–dS = 0.97(12)(6), and gu–dT = 0.987(51)(20). The first errormore »
- Authors:
-
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Univ. of Washington, Seattle, WA (United States)
- Univ. of California, Berkeley, CA (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE
- Contributing Org.:
- Precision Neutron Decay Matrix Elements (PNDME) Collaboration
- OSTI Identifier:
- 1343698
- Alternate Identifier(s):
- OSTI ID: 1328532
- Report Number(s):
- LA-UR-16-20522
Journal ID: ISSN 2470-0010; PRVDAQ; TRN: US1701629
- Grant/Contract Number:
- AC52-06NA25396; KA-1401020; AC02-05CH11231; FG02-97ER4014
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Physical Review D
- Additional Journal Information:
- Journal Volume: 94; Journal Issue: 5; Journal ID: ISSN 2470-0010
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; atomic and nuclear physics
Citation Formats
Bhattacharya, Tanmoy, Cirigliano, Vincenzo, Cohen, Saul D., Gupta, Rajan, Lin, Huey -Wen, and Yoon, Boram. Axial, scalar, and tensor charges of the nucleon from 2+1+1-flavor lattice QCD. United States: N. p., 2016.
Web. doi:10.1103/PhysRevD.94.054508.
Bhattacharya, Tanmoy, Cirigliano, Vincenzo, Cohen, Saul D., Gupta, Rajan, Lin, Huey -Wen, & Yoon, Boram. Axial, scalar, and tensor charges of the nucleon from 2+1+1-flavor lattice QCD. United States. https://doi.org/10.1103/PhysRevD.94.054508
Bhattacharya, Tanmoy, Cirigliano, Vincenzo, Cohen, Saul D., Gupta, Rajan, Lin, Huey -Wen, and Yoon, Boram. 2016.
"Axial, scalar, and tensor charges of the nucleon from 2+1+1-flavor lattice QCD". United States. https://doi.org/10.1103/PhysRevD.94.054508. https://www.osti.gov/servlets/purl/1343698.
@article{osti_1343698,
title = {Axial, scalar, and tensor charges of the nucleon from 2+1+1-flavor lattice QCD},
author = {Bhattacharya, Tanmoy and Cirigliano, Vincenzo and Cohen, Saul D. and Gupta, Rajan and Lin, Huey -Wen and Yoon, Boram},
abstractNote = {Here, we present results for the isovector axial, scalar, and tensor charges gu–dA, gu–dS, and gu–dT of the nucleon needed to probe the Standard Model and novel physics. The axial charge is a fundamental parameter describing the weak interactions of nucleons. The scalar and tensor charges probe novel interactions at the TeV scale in neutron and nuclear β-decays, and the flavor-diagonal tensor charges guT, gdT, and gsT are needed to quantify the contribution of the quark electric dipole moment (EDM) to the neutron EDM. The lattice-QCD calculations were done using nine ensembles of gauge configurations generated by the MILC Collaboration using the highly improved staggered quarks action with 2+1+1 dynamical flavors. These ensembles span three lattice spacings a ≈ 0.06,0.09, and 0.12 fm and light-quark masses corresponding to the pion masses Mπ ≈ 135, 225, and 315 MeV. High-statistics estimates on five ensembles using the all-mode-averaging method allow us to quantify all systematic uncertainties and perform a simultaneous extrapolation in the lattice spacing, lattice volume, and light-quark masses for the connected contributions. Our final estimates, in the ¯MS scheme at 2 GeV, of the isovector charges are gu–dA = 1.195(33)(20), gu–dS = 0.97(12)(6), and gu–dT = 0.987(51)(20). The first error includes statistical and all systematic uncertainties except that due to the extrapolation Ansatz, which is given by the second error estimate. Combining our estimate for gu–dS with the difference of light quarks masses (md–mu)QCD = 2.67(35) MeV given by the Flavor Lattice Average Group, we obtain (MN – MP)QCD = 2.59(49) MeV. Estimates of the connected part of the flavor-diagonal tensor charges of the proton are guT = 0.792(42) and gdT = –0.194(14). Combining our new estimates with precision low-energy experiments, we present updated constraints on novel scalar and tensor interactions, εS,T, at the TeV scale.},
doi = {10.1103/PhysRevD.94.054508},
url = {https://www.osti.gov/biblio/1343698},
journal = {Physical Review D},
issn = {2470-0010},
number = 5,
volume = 94,
place = {United States},
year = {Mon Sep 19 00:00:00 EDT 2016},
month = {Mon Sep 19 00:00:00 EDT 2016}
}
Web of Science
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