Axial, scalar, and tensor charges of the nucleon from $2+1+1$flavor lattice QCD
Here, we present results for the isovector axial, scalar, and tensor charges g ^{u–d} _{A}, g ^{u–d} _{S}, and g ^{u–d} _{T} 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 βdecays, and the flavordiagonal tensor charges g ^{u} _{T}, g ^{d} _{T}, and g ^{s} _{T} are needed to quantify the contribution of the quark electric dipole moment (EDM) to the neutron EDM. The latticeQCD 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 lightquark masses corresponding to the pion masses M _{π} ≈ 135, 225, and 315 MeV. Highstatistics estimates on five ensembles using the allmodeaveraging method allow us to quantify all systematic uncertainties and perform a simultaneous extrapolation in the lattice spacing, lattice volume, and lightquark masses for the connected contributions. Our final estimates, in the ¯MS scheme at 2 GeV, of the isovector charges aremore »
 Authors:

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 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:
 Report Number(s):
 LAUR1620522
Journal ID: ISSN 24700010; PRVDAQ; TRN: US1701629
 Grant/Contract Number:
 AC5206NA25396; KA1401020; AC0205CH11231; FG0297ER4014
 Type:
 Accepted Manuscript
 Journal Name:
 Physical Review D
 Additional Journal Information:
 Journal Volume: 94; Journal Issue: 5; Journal ID: ISSN 24700010
 Publisher:
 American Physical Society (APS)
 Research Org:
 Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
 Sponsoring Org:
 USDOE
 Contributing Orgs:
 Precision Neutron Decay Matrix Elements (PNDME) Collaboration
 Country of Publication:
 United States
 Language:
 English
 Subject:
 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; atomic and nuclear physics
 OSTI Identifier:
 1343698
 Alternate Identifier(s):
 OSTI ID: 1328532
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+1flavor lattice QCD. United States: N. p.,
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+1flavor lattice QCD. United States. doi: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+1flavor lattice QCD". United States.
doi: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+1flavor 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 βdecays, and the flavordiagonal tensor charges guT, gdT, and gsT are needed to quantify the contribution of the quark electric dipole moment (EDM) to the neutron EDM. The latticeQCD 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 lightquark masses corresponding to the pion masses Mπ ≈ 135, 225, and 315 MeV. Highstatistics estimates on five ensembles using the allmodeaveraging method allow us to quantify all systematic uncertainties and perform a simultaneous extrapolation in the lattice spacing, lattice volume, and lightquark 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 flavordiagonal tensor charges of the proton are guT = 0.792(42) and gdT = –0.194(14). Combining our new estimates with precision lowenergy experiments, we present updated constraints on novel scalar and tensor interactions, εS,T, at the TeV scale.},
doi = {10.1103/PhysRevD.94.054508},
journal = {Physical Review D},
number = 5,
volume = 94,
place = {United States},
year = {2016},
month = {9}
}