Isovector charges of the nucleon from 2+1 -flavor QCD with clover fermions

(Nucleon Matrix Elements (NME) Collaboration)

doi:10.1103/PhysRevD.95.074508

Isovector charges of the nucleon from 2+1 -flavor QCD with clover fermions

(Nucleon Matrix Elements (NME) Collaboration)

Research output: Contribution to journal › Article › peer-review

50 Scopus citations

Abstract

We present high-statistics estimates of the isovector charges of the nucleon from four 2+1-flavor ensembles generated using Wilson-clover fermions with stout smearing and tree-level tadpole improved Symanzik gauge action at lattice spacings a≈0.127 and 0.09 fm and with Mπ≈280 and 170 MeV. The truncated solver method with bias correction and the coherent source sequential propagator construction are used to cost-effectively achieve O(105) measurements on each ensemble. Using these data, the analysis of two-point correlation functions is extended to include four states in the fits, and of three-point functions to three states. Control over excited-state contamination in the calculation of the nucleon mass, the mass gaps between excited states, and in the matrix elements is demonstrated by the consistency of estimates using this multistate analysis of the spectral decomposition of the correlation functions and from simulations of the three-point functions at multiple values of the source-sink separation. The results for all three charges, gA, gS and gT, are in good agreement with calculations done using the clover-on-HISQ lattice formulation with similar values of the lattice parameters.

Original language	English
Article number	074508
Journal	Physical Review D
Volume	95
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevD.95.074508
State	Published - Apr 1 2017
Externally published	Yes

Funding

The work of T. Bhattacharya, R. Gupta, J-C Jang and B.Yoon is supported by the U.S. Department of Energy, Office of Science, Office of High Energy Physics under Contract No. DE-KA-1401020 and the LANL LDRD program. The work of J.Green was supported by the PRISMA Cluster of Excellence at the University of Mainz. The work of H-W. Lin is supported in part by the M. Hildred Blewett Fellowship of the American Physical Society. B. Jo, K. Orginos, D. G. Richards, S. Syritsyn and F. Winter are supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under Contract No. DE-AC05-06OR23177.

Funders	Funder number
LANL LDRD
University of Mainz
U.S. Department of Energy
American Physical Society
Office of Science
High Energy Physics	DE-KA-1401020
Nuclear Physics	DE-AC05-06OR23177

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10.1103/PhysRevD.95.074508

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title = "Isovector charges of the nucleon from 2+1 -flavor QCD with clover fermions",

abstract = "We present high-statistics estimates of the isovector charges of the nucleon from four 2+1-flavor ensembles generated using Wilson-clover fermions with stout smearing and tree-level tadpole improved Symanzik gauge action at lattice spacings a≈0.127 and 0.09 fm and with Mπ≈280 and 170 MeV. The truncated solver method with bias correction and the coherent source sequential propagator construction are used to cost-effectively achieve O(105) measurements on each ensemble. Using these data, the analysis of two-point correlation functions is extended to include four states in the fits, and of three-point functions to three states. Control over excited-state contamination in the calculation of the nucleon mass, the mass gaps between excited states, and in the matrix elements is demonstrated by the consistency of estimates using this multistate analysis of the spectral decomposition of the correlation functions and from simulations of the three-point functions at multiple values of the source-sink separation. The results for all three charges, gA, gS and gT, are in good agreement with calculations done using the clover-on-HISQ lattice formulation with similar values of the lattice parameters.",

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AU - Gupta, Rajan

AU - Bhattacharya, Tanmoy

AU - Green, Jeremy

AU - Joó, Bálint

AU - Lin, Huey Wen

AU - Orginos, Kostas

AU - Richards, David

AU - Syritsyn, Sergey

AU - Winter, Frank

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N2 - We present high-statistics estimates of the isovector charges of the nucleon from four 2+1-flavor ensembles generated using Wilson-clover fermions with stout smearing and tree-level tadpole improved Symanzik gauge action at lattice spacings a≈0.127 and 0.09 fm and with Mπ≈280 and 170 MeV. The truncated solver method with bias correction and the coherent source sequential propagator construction are used to cost-effectively achieve O(105) measurements on each ensemble. Using these data, the analysis of two-point correlation functions is extended to include four states in the fits, and of three-point functions to three states. Control over excited-state contamination in the calculation of the nucleon mass, the mass gaps between excited states, and in the matrix elements is demonstrated by the consistency of estimates using this multistate analysis of the spectral decomposition of the correlation functions and from simulations of the three-point functions at multiple values of the source-sink separation. The results for all three charges, gA, gS and gT, are in good agreement with calculations done using the clover-on-HISQ lattice formulation with similar values of the lattice parameters.

AB - We present high-statistics estimates of the isovector charges of the nucleon from four 2+1-flavor ensembles generated using Wilson-clover fermions with stout smearing and tree-level tadpole improved Symanzik gauge action at lattice spacings a≈0.127 and 0.09 fm and with Mπ≈280 and 170 MeV. The truncated solver method with bias correction and the coherent source sequential propagator construction are used to cost-effectively achieve O(105) measurements on each ensemble. Using these data, the analysis of two-point correlation functions is extended to include four states in the fits, and of three-point functions to three states. Control over excited-state contamination in the calculation of the nucleon mass, the mass gaps between excited states, and in the matrix elements is demonstrated by the consistency of estimates using this multistate analysis of the spectral decomposition of the correlation functions and from simulations of the three-point functions at multiple values of the source-sink separation. The results for all three charges, gA, gS and gT, are in good agreement with calculations done using the clover-on-HISQ lattice formulation with similar values of the lattice parameters.

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Isovector charges of the nucleon from 2+1 -flavor QCD with clover fermions

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