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Proton and neutron electromagnetic radii and magnetic moments from $N_f = 2 + 1$ lattice QCD

Publikationstyp:

Konferenzbeitrag

Metadaten:

Autoren

Miguel Salg
Dalibor Djukanovic
Georg von Hippel
Harvey B Meyer
Konstantin Ottnad
Hartmut Wittig

DOI

10.22323/1.453.0317

Zeitschrift

Proceedings of The 40th International Symposium on Lattice Field Theory — PoS(LATTICE2023)

Name of conference

The 40th International Symposium on Lattice Field Theory

Datum der Veröffentlichung

2023

Status

Published

Herausgeber

Sissa Medialab

Herausgeber URL

http://dx.doi.org/10.22323/1.453.0317

Datum der Datenerfassung

2023

Conference start date

2023

Titel

Proton and neutron electromagnetic radii and magnetic moments from $N_f = 2 + 1$ lattice QCD

Datenquelle: Crossref

Andere Metadatenquellen:

Abstract

We present results for the electromagnetic form factors of the proton and neutron computed on the $(2 + 1)$-flavor Coordinated Lattice Simulations (CLS) ensembles including both quark-connected and -disconnected contributions. The $Q^2$-, pion-mass, lattice-spacing, and finite-volume dependence of our form factor data is fitted simultaneously to the expressions resulting from covariant chiral perturbation theory including vector mesons amended by models for lattice artefacts. From these fits, we determine the electric and magnetic radii and the magnetic moments of the proton and neutron, as well as the Zemach radius of the proton. To assess the influence of systematic effects, we average over various cuts in the pion mass and the momentum transfer, as well as over different models for the lattice-spacing and finite-volume dependence, using weights derived from the Akaike Information Criterion (AIC). Our results for the magnetic moments of the proton and neutron are in good agreement with the experimental values and have a relative precision of about $2.4\,\%$ and $3.7\,\%$, respectively. For the electromagnetic radii of the proton, we achieve a precision at the $1.5\,\%$ level.

Autoren