The Stochastic Feynman-Hellmann Method
A.S. Gambhir*,
D. Brantley,
P. Vranas,
E. Berkowitz,
C. Chang,
K. Clark,
T. Kurth,
A. Walker-Loud,
C. Monahan and
A. Nicholson*: corresponding author
Published on:
May 29, 2019
Abstract
The Feynman-Hellmann method, as implemented by Bouchard et al. [1612.06963], was recently employed successfully to determine the nucleon axial charge. A limitation of the method was the restriction to a single operator and a single momentum during the computation of each "Feynman-Hellmann" propagator. By using stochastic techniques to estimate the all-to-all propagator, we relax this constraint and demonstrate the successful implementation of this new method. We show reproduction of the axial charge on a test ensemble and non-zero momentum transfer points of the axial and vector form factors.
DOI: https://doi.org/10.22323/1.334.0126
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