Nucleon matrix elements using the variational method in lattice QCD

Jack Dragos, Roger Horsley, Waseem Kamleh, Derek B. Leinweber, Yoshifumi Nakamura, Paul E. L. Rakow, Gerrit Schierholz, Ross D. Young, James M. Zanotti

Research output: Contribution to journalArticlepeer-review


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 $g_{A}$, the scalar current $g_{S}$ and the quark momentum fraction $\left $ 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.
Original languageEnglish
Article number074505
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number7
Publication statusPublished - 25 Oct 2016


  • hep-lat


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