Isospin splittings in the decuplet baryon spectrum from dynamical QCD+QED
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.
Keywords
Cite
@article{arxiv.1904.02304,
title = {Isospin splittings in the decuplet baryon spectrum from dynamical QCD+QED},
author = {R. Horsley and Z. Koumi and Y. Nakamura and H. Perlt and D. Pleiter and P. E. L. Rakow and G. Schierholz and A. Schiller and H. Stüben and R. D. Young and J. M. Zanotti},
journal= {arXiv preprint arXiv:1904.02304},
year = {2019}
}
Comments
17 pages, 7 tables, 5 figures. Version accepted for publication in J.Phys.G