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Type: Journal article
Title: Nucleon matrix elements using the variational method in lattice QCD
Author: Dragos, J.
Horsley, R.
Kamleh, W.
Leinweber, D.
Nakamura, Y.
Rakow, P.
Schierholz, G.
Young, R.
Zanotti, J.
Citation: Physical Review D, 2016; 94(7):074505-1-074505-16
Publisher: American Physical Society
Issue Date: 2016
ISSN: 2470-0010
Statement of
J. Dragos, R. Horsley, W. Kamleh, D. B. Leinweber, Y. Nakamura, P. E. L. Rakow, G. Schierholz, R. D. Young, and J. M. Zanotti
Abstract: The extraction of hadron matrix elements in lattice QCD using the standard two- and three-point correlator functions demands careful attention to systematic uncertainties. One of the most commonly studied sources of systematic error is contamination from excited states. We apply the variational method to calculate the axial vector current gA, the scalar current gS, the scalar current gT and the quark momentum fraction ⟨x⟩ of the nucleon and we compare the results to the more commonly used summation and two-exponential fit methods. The results demonstrate that the variational approach offers a more efficient and robust method for the determination of nucleon matrix elements.
Description: Published 25 October 2016
Rights: © 2016 American Physical Society
RMID: 0030057676
DOI: 10.1103/PhysRevD.94.074505
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Appears in Collections:Physics publications

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