Isovector nucleon form factors from 2+1-flavor dynamical domain-wall lattice QCD at the physical mass

2022/11/29 by Ohta, Shigemi
#FOS: Physical sciences #High Energy Physics - Lattice (hep-lat)

paper · doi:10.48550/arxiv.2211.16018

Abstract

Nucleon isovector form factors calculated on a 2+1-flavor domain-wall-fermions ensemble with strange and degenerate up and down quarks at physical mass and lattice cut off, a^-1, of about 1.730(4) GeV, are reported. The ensemble was generated jointly by RBC and UKQCD collaborations with a spatial extent of 48a or about 5.5 fm. The form factors are calculated in collaboration with LHP collaboration as well. The resulting shape parameters of the form factors, such as vector-charge mean squared radius, ⟨ r₁²⟩, or anomalous magnetic moment, F₂(0) appear less dependent on possible excited-state contaminations than the corresponding charges. Preliminary estimates are ⟨ r₁²⟩ ∼ 0.142(13) fm² and F₂(0) ∼ 3.22(8).

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