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Nucleon Electromagnetic Structure from Lattice QCD

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Published: Jan 1, 2020
DOI: https://doi.org/10.12681/hnps.2617
C. Alexandrou
UCy
G. Koutsou
UCy
H. Neff
UCL
J. W. Negele
MIT
W. Schroers
DESY
A. Tsapalis
IASA
Abstract

We present an evaluation of nucleon to Δ electromagnetic form factors within Lattice QCD. The EMR and CMR ratios are calculated both in the quenched theory and using two degenerate flavors of dynamical Wilson fermions. We obtain values in qualitative agreement to experiment. In addition, we evaluate the isovector Sachs electromagnetic form factors of the nucleon both in the quenched and unquenched theory for momentum transfer squared in the range between 0.1 and 2 GeV2. The nucleon magnetic moment and r.m.s. radii are obtained using chiral effective theory to extrapolate to the physical pion mass.

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