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Volume 334 - The 36th Annual International Symposium on Lattice Field Theory (LATTICE2018) - Hadron Structure
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, A. Nicholson
*corresponding author
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Published on: 2019 May 29
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.
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