Isospin breaking in octet baryon mass splittings

Autor:	Horsley, R., Najjar, J., Nakamura, Y., Pleiter, D., Rakow, P. E. L., Schierholz, G., Zanotti, J. M.
Rok vydání:	2012
Předmět:	High Energy Physics - Lattice High Energy Physics - Phenomenology Nuclear Theory
Zdroj:	Phys. Rev. D 86 (2012) 114511
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevD.86.114511
Popis:	Using an SU(3) flavour symmetry breaking expansion in the quark mass, we determine the QCD component of the nucleon, Sigma and Xi mass splittings of the baryon octet due to up-down (and strange) quark mass differences in terms of the kaon mass splitting. Provided the average quark mass is kept constant, the expansion coefficients in our procedure can be determined from computationally cheaper simulations with mass degenerate sea quarks and partially quenched valence quarks. Both the linear and quadratic terms in the SU(3) flavour symmetry breaking expansion are considered; it is found that the quadratic terms only change the result by a few percent, indicating that the expansion is highly convergent. Comment: 31 pages, 8 figures, published version
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1206.3156 Zobrazit plný text záznamu View this record from Arxiv