Author
Takahashi, T. T., Erkol, Güray, Oka, M.
Publication Date
2010-04-01
Publication Place
-
Elsevier
Subject
Meson-baryon coupling constant, Hyperon axial charge, Lattice QCD
Type
Periodical
Language
English
Digital
Yes
Manuscript
No
Library
Özyeğin University
Library Asset ID
2-s2.0-77749291975
Record ID
4252999d-a9d1-4d12-81ec-b2a6ce3df5de
Library Location
Natural and Mathematical Sciences
Date
2010-04-01
Sample Text
We evaluate the pseudoscalar-meson octet-baryon coupling constants and the corresponding axial charges in eight channels (πNN, πΣΣ, πΛΣ, KΛN, KΣN, πΞΞ, KΛΞ and KΣΞ) in lattice QCD with two flavors of dynamical quarks. The parameter α≡F/(F+D) representing the SU(3)-flavor symmetry is computed at each u,d-quark hopping parameter and at the flavor-SU(3) symmetric point where the three quark flavors are degenerate at the physical s-quark mass. In particular, we obtain α=0.395(6) at the SU(3) symmetric limit. The quark-mass dependences of the coupling constants are obtained by changing the u- and the d-quark masses and we find that the SU(3)-flavor symmetry is broken by only a few percent at each quark-mass we employ.
DOI
10.1016/j.nuclphysa.2010.01.215
Cilt
835
