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

Isospin splittings in the decuplet baryon spectrum from dynamical QCD + QED
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DOI：
10.1088/1361-6471/ab32c1
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发表时间：
2019-04
期刊：
Journal of Physics G: Nuclear and Particle Physics
影响因子：
--
通讯作者：
R. Horsley;Z. Koumi;Y. Nakamura;H. Perlt;D. Pleiter;P. Rakow;G. Schierholz;A. Schiller;H. Stüben;Ross D. Young;J. Zanotti
R. Horsley;Z. Koumi;Y. Nakamura;H. Perlt;D. Pleiter;P. Rakow;G. Schierholz;A. Schiller;H. Stüben;Ross D. Young;J. Zanotti
中科院分区：
其他
文献类型：
--
作者：
R. Horsley;Z. Koumi;Y. Nakamura;H. Perlt;D. Pleiter;P. Rakow;G. Schierholz;A. Schiller;H. Stüben;Ross D. Young;J. Zanotti

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我们报告了对重子谱中同位旋分裂的新分析。我们的数值结果是基于五个动态QCD+QED晶格的系综。分析是在破味扩展中进行的，该扩展编码了将夸克质量和电磁电荷从近似SU(3)对称点上破味的影响。结果显示了与现象学估计相容的近似SU(2)多重子内的总同位旋分裂。此外，通过分离强效应和电磁效应产生的贡献，对这些分裂有了新的认识。我们还提出了对八元重子谱的早期结果的更新。
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.