We study the isospin breaking effect on octet baryons. Using the two-flavor dynamical domain-wall QCD configurations combined with the quenched non-compact QED configurations, the electromagnetic mass splittings between isomultiplets (p, n), (Sigma^+, Sigma^0, Sigma^-), (Xi^0, Xi^-) are investigated. We evaluate the main source of statistical fluctuations in the two-point correlation function, and find that the elimination of O(e) fluctuation (e: the QED charge) is essential to extract the signal. Preliminary results for mp−mn as well as other mass splittings are presented. Possible origin of systematic uncertainty is also discussed.
@article{arxiv.hep-lat/0610095,
title = {The isospin breaking effect on baryons with Nf=2 domain wall fermions},
author = {Takumi Doi and Thomas Blum and Masashi Hayakawa and Taku Izubuchi and Norikazu Yamada},
journal= {arXiv preprint arXiv:hep-lat/0610095},
year = {2008}
}
Comments
Talk given at 24th International Symposium on Lattice Field Theory (LATTICE 2006), Tucson, Arizona, USA, 23-28 Jul. 2006 (Hadron Spectroscopy), 7pages, 4figures