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Title: Isovector and isoscalar tensor charges of the nucleon from lattice QCD

Journal Article · · Physical Review. D, Particles, Fields, Gravitation and Cosmology
 [1];  [1];  [2];  [1];  [3];  [4];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Univ. of Washington, Seattle, WA (United States)
  3. John von Neumann Institute for Computing, DESY, Zeuthen (Germany)
  4. Univ. of California, Berkeley, CA (United States)

Here, we present results for the isovector and flavor diagonal tensor charges gu–dT, guT, gdT, and gsT needed to probe novel tensor interactions at the TeV scale in neutron and nuclear β-decays and 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 HISQ action with 2+1+1 dynamical flavors. These ensembles span three lattice spacings a ≈ 0.06, 0.09 and 0.12 fm and three quark masses corresponding to the pion masses Mπ ≈ 130, 220 and 310 MeV. Using estimates from these ensembles, we quantify all systematic uncertainties and perform a simultaneous extrapolation in the lattice spacing, volume and light quark masses for the connected contributions. The final estimates of the connected nucleon (proton) tensor charge for the isovector combination is gu–dT = 1.020(76) in the MS¯ scheme at 2 GeV. The additional disconnected quark loop contributions needed for the flavor-diagonal matrix elements are calculated using a stochastic estimator employing the truncated solver method with the all-mode-averaging technique. We find that the size of the disconnected contribution is smaller than the statistical error in the connected contribution. This allows us to bound the disconnected contribution and include it as an additional uncertainty in the flavor-diagonal charges. After a continuum extrapolation, we find guT = 0.774(66), gdT = –0.233(28) and gu+dT = 0.541(67). The strangeness tensor charge, that can make a significant contribution to the neutron EDM due to the large ratio ms/mu,d, is gsT = 0.008(9) in the continuum limit.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-06NA25396; AC02-05CH11231; KA-1401020; FG02-97ER4014
OSTI ID:
1248743
Alternate ID(s):
OSTI ID: 1225679
Report Number(s):
LA-UR-15-23801; PRVDAQ
Journal Information:
Physical Review. D, Particles, Fields, Gravitation and Cosmology, Vol. 92, Issue 9; ISSN 1550-7998
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 90 works
Citation information provided by
Web of Science

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A Guide to Light-Cone PDFs from Lattice QCD: An Overview of Approaches, Techniques, and Results journal June 2019
Nucleon scalar and tensor charges using lattice QCD simulations at the physical value of the pion mass text January 2017
Updated lattice results for parton distributions text January 2017
Erratum: Nucleon scalar and tensor charges using lattice QCD simulations at the physical value of the pion mass [Phys. Rev. D 95 , 114514 (2017)] text January 2017
FLAG Review 2019 text January 2019
Pion Distribution Amplitude from Lattice QCD journal August 2013
FLAG Review 2019: Flavour Lattice Averaging Group (FLAG) journal February 2020
Isovector charges of the nucleon from 2 + 1 -flavor QCD with clover fermions text January 2017
Nucleon scalar and tensor charges using lattice QCD simulations at the physical value of the pion mass text January 2017
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Nucleon and pion structure with lattice QCD simulations at physical value of the pion mass text January 2015
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Constraining the top-Higgs sector of the Standard Model Effective Field Theory text January 2016
Updated Lattice Results for Parton Distributions text January 2016
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Axial Vector Form Factors of the Nucleon from Lattice QCD text January 2017
First Monte Carlo global analysis of nucleon transversity with lattice QCD constraints text January 2017
First Extraction of Transversity from a Global Analysis of Electron-Proton and Proton-Proton Data text January 2018
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