Delta-baryon electromagnetic form factors in lattice QCD

TL;DR

This paper develops lattice QCD techniques to compute the electromagnetic form factors of the Delta baryon, including the electric quadrupole form factor, and explores their implications for baryon deformation.

Contribution

It introduces new methods for calculating Delta electromagnetic form factors in lattice QCD, focusing on the electric quadrupole form factor and quark mass extrapolations.

Findings

Calculated Delta magnetic moment and charge density distributions.

Presented results for pion masses down to 350 MeV across different QCD simulations.

Provided insights into Delta deformation through form factor analysis.

Abstract

We develop techniques to calculate the four Delta electromagnetic form factors using lattice QCD, with particular emphasis on the sub-dominant electric quadrupole form factor that probes deformation of the Delta. Results are presented for pion masses down to approximately 350 MeV for three cases: quenched QCD, two flavors of dynamical Wilson quarks, and three flavors of quarks described by a mixed action combining domain wall valence quarks and dynamical staggered sea quarks. The magnetic moment of the Delta is chirally extrapolated to the physical point and the Delta charge density distributions are discussed.