# Isospin splittings in the decuplet baryon spectrum from dynamical QCD+QED

## TL;DR

This paper presents a lattice QCD+QED analysis of isospin splittings in decuplet baryons, separating strong and electromagnetic effects, and updates previous results on octet baryons, aligning with phenomenological estimates.

## Contribution

It introduces a flavor-breaking expansion method for analyzing isospin splittings in baryons using dynamical QCD+QED lattices, providing new insights into strong and electromagnetic contributions.

## Key findings

- Isospin splittings compatible with phenomenological estimates
- Separation of strong and electromagnetic effects
- Updated results on octet baryon spectrum

## Abstract

We report a new analysis of the isospin splittings within the decuplet baryon spectrum. Our numerical results are based upon five ensembles of dynamical QCD+QED lattices. The analysis is carried out within a flavour-breaking expansion which encodes the effects of breaking the quark masses and electromagnetic charges away from an approximate SU(3) symmetric point. The results display total isospin splittings within the approximate SU(2) multiplets that are compatible with phenomenological estimates. Further, new insight is gained into these splittings by separating the contributions arising from strong and electromagnetic effects. We also present an update of earlier results on the octet baryon spectrum.