Pseudoscalar-meson--octet-baryon coupling constants in two-flavor lattice QCD

Details Pseudoscalar-meson--octet-baryon coupling constants in two-flavor lattice QCD Pseudoscalar-meson--octet-baryon coupling constants in two-flavor lattice QCD

2008-05-20

arxiv.org/abs/0805.3068v2

Phys.Rev.D79:074509,2009

Physics

High Energy Physics

High Energy Physics - Lattice

6 pages, 7 figures, version to be published in PRD

Scientific paper

10.1103/PhysRevD.79.074509

We evaluate the $\pi N!N$, $\pi\Sigma\Sigma$, $\pi\Lambda\Sigma$, $K\Lambda N$ and $K \Sigma N $ coupling constants and the corresponding monopole masses in lattice QCD with two flavors of dynamical quarks. The parameters representing the SU(3)-flavor symmetry are computed at the point where the three quark flavors are degenerate at the physical $s$-quark mass. In particular, we obtain $\alpha\equiv F/(F+D)=0.395(6)$. The quark-mass dependences of the coupling constants are obtained by changing the $u$- and the $d$-quark masses. We find that the SU(3)-flavor parameters have weak quark-mass dependence and thus the SU(3)-flavor symmetry is broken by only a few percent at each quark-mass point we consider.

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