The isospin breaking effect on baryons with Nf=2 domain wall fermions
Takumi Doi, Thomas Blum, Masashi Hayakawa, Taku Izubuchi, Norikazu Yamada
Abstract
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+, Sigma0, Sigma-), (Xi0, 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.
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