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

Abstract

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.

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

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• Light Hadron Spectroscopy with Two Flavors of Dynamical Quarks on the Lattice
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• Determination of the pion-nucleon coupling constant and scattering lengths
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Cited by in corpus (12)

• Hidden dibaryons in one- and two-pion production in NN collisions
• Axial Charges of Octet Baryons in Two-flavor Lattice QCD
• Negative parity $\Lambda$ and $\Sigma$ resonances coupled to pseudoscalar and vector mesons
• Low-lying $\Lambda$ Baryons with spin 1/2 in Two-flavor Lattice QCD
• Isovector axial-vector form factors of octet baryons in QCD
• Manifestation of the $P$-wave diproton resonance in single-pion production in $pp$ collisions
• Three pion nucleon coupling constants
• ${\Lambda }_c{\Sigma }_c\pi$ coupling and ${\Sigma }_c\to {\Lambda }_c\pi$ decay in lattice QCD
• $P$-wave dibaryon resonances in $pp$ elastic scattering and near-threshold pion production
• Meson-cloud effects in the electromagnetic nucleon structure
• ${\Lambda }_c\to \Lambda$ Form Factors in Lattice QCD
• Pseudoscalar-Meson Octet-Baryon Coupling Constants from two-flavor Lattice QCD