Nucleon electromagnetic form factors at high Q² from Wilson-clover fermions

2018/10/09 by Kallidonis, Christos, Syritsyn, Sergey, Engelhardt, Michael +4
#FOS: Physical sciences #High Energy Physics - Lattice (hep-lat)

paper · doi:10.48550/arxiv.1810.04294

Abstract

We present results on the nucleon electromagnetic form factors from Lattice QCD at momentum transfer up to about 12~GeV². We analyze two gauge ensembles with the Wilson-clover fermion action, a lattice spacing of a≈ 0.09~fm and pion masses m_π≈ 170~MeV and m_π≈ 280~MeV. In our analysis we employ momentum smearing as well as a set of techniques to investigate excited state effects. Good agreement with experiment and phenomenology is found for the ratios G_E/G_M and F₂/F₁, whereas discrepancies are observed for the individual form factors F₁ and F₂. We discuss various systematics that may affect our calculation.

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