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Type: Journal article
Title: Isospin splittings in the decuplet baryon spectrum from dynamical QCD+QED
Author: Horsley, R.
Koumi, Z.
Nakamura, Y.
Perlt, H.
Pleiter, D.
Rakow, P.E.L.
Schierholz, G.
Schiller, A.
Stüben, H.
Young, R.D.
Zanotti, J.M.
Citation: Journal of Physics G: Nuclear and Particle Physics, 2019; 46(11):115004-1-115004-17
Publisher: IOP Publishing
Issue Date: 2019
ISSN: 0954-3899
Statement of
R Horsley, Z Koumi, Y Nakamura, H Perlt, D Pleiter, P E L Rakow, G Schierholz, A Schiller, H Stüben, R D Young, J M Zanotti, and CSSM/QCDSF/UKQCD Collaboration
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: Lattice QCD+QED; isospin splittings; decuplet
Rights: © 2019 IOP Publishing Ltd
DOI: 10.1088/1361-6471/ab32c1
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