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

May, 2008
4 pages
Published in:
  • Phys.Rev.D 79 (2009) 074509
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Abstract: (arXiv)
We evaluate the πNN\pi N N, πΣΣ\pi\Sigma\Sigma, πΛΣ\pi\Lambda\Sigma, KΛNK\Lambda N and KΣNK \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 ss-quark mass. In particular, we obtain α≡F/(F+D)=0.384(8)\alpha\equiv F/(F+D)=0.384(8). The quark-mass dependences of the coupling constants are obtained by changing the uu- and the dd-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 in the chiral limit.
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