Volume 396 - The 38th International Symposium on Lattice Field Theory (LATTICE2021) - Oral presentation
Nucleon Form Factors from the Feynman-Hellmann Method in Lattice QCD
M. Batelaan*, R. Horsley, Y. Nakamura, H. Perlt, D. Pleiter, P. Rakow, G. Schierholz, H. Stuben, R. Young, J. Zanotti  on behalf of QCDSF-UKQCD-CSSM collaboration
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Pre-published on: May 16, 2022
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Abstract
Lattice QCD calculations of the nucleon electromagnetic form factors are of interest at
both the high and low momentum transfer regions. For high momentum transfers especially there
are open questions which require more intense study, such as the potential zero crossing in the
proton’s electric form factor. We will present recent progress from the QCDSF/UKQCD/CSSM
collaboration on the calculation of these form factors using the Feynman-Hellmann method in
lattice QCD. The Feynman-Hellmann method allows for greater control over excited states which
we take advantage of by going to high values of the momentum transfer. In this proceeding we
present results of the form factors up to $6\ \textrm{GeV}^2$ , using $𝑁_f=2+1$ flavour fermions for three
different pion masses in the range $310-470 \textrm{MeV}$. The results are extrapolated to the physical pion
mass through the use of a flavour breaking expansion.
DOI: https://doi.org/10.22323/1.396.0426
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