Mass-splittings in the baryon octet and the nucleon σ-term in lattice QCD

Autor:	K.H. Mütter, S. Güsken, Apoorva Patel, R. Sommer, K. Schilling
Rok vydání:	1988
Předmět:	Quantum chromodynamics Quark Physics Nuclear and High Energy Physics Particle physics Octet High Energy Physics::Lattice Nuclear Theory High Energy Physics::Phenomenology Lattice QCD Baryon High Energy Physics::Experiment Symmetry breaking Nucleon Chiral symmetry breaking Particle Physics - Theory
Zdroj:	Physics Letters B. 212:216-220
ISSN:	0370-2693
DOI:	10.1016/0370-2693(88)90528-x
Popis:	We calculate in the valence approximation the F and D parameters governing the mass-splittings in the baryon octet. The use of an improved fermion action enables us to go down in quark mass to the SU (3) symmetric point. The F parameter is consistent with its experimental value. On the other hand, the D parameter turns out to be large and shows a strong dependence on the quark mass. This is evidence that the Σ − gL mass-splitting is not a first-order SU (3) flavour symmetry breaking effect. We also estimate the contribution of the valence quarks to the nucleon σ-term.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dc1be38a43ff16d1c4507242ca05b9af https://doi.org/10.1016/0370-2693(88)90528-x Zobrazit plný text záznamu