Axial charges of N(1535) and N(1650) in lattice QCD with two flavors of dynamical quarks

Abstract

We show the first lattice QCD results on the axial charge $g_A^{N^{\ast }{N}^{\ast }}$ of $N^{\ast }(1535)$ and $N^{\ast }(1650)$. The measurements are performed with two flavors of dynamical quarks employing the renormalization-group improved gauge action at $\beta$=1.95 and the mean-field improved clover quark action with the hopping parameters, $\kappa$=0.1375, 0.1390 and 0.1400. In order to properly separate signals of $N^{\ast }(1535)$ and $N^{\ast }(1650)$, we construct 2$\times$2 correlation matrices and diagonalize them. Wraparound contributions in the correlator, which can be another source of signal contaminations, are eliminated by imposing the Dirichlet boundary condition in the temporal direction. We find that the axial charge of $N^{\ast }(1535)$ takes small values as $g_A^{N^{\ast }{N}^{\ast }}\sim \mathcal{O}(0.1)$, whereas that of $N^{\ast }(1650)$ is about 0.5, which is found independent of quark masses and consistent with the predictions by the naive nonrelativistic quark model.

arXiv comment5pages, 3 figures, 1 table; Confusing notations were corrected. (v2); Results on N(1650) were added. (v3)

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• Chiral Unitary Approach To The N*N*pi, N*N*eta Couplings For The N*(1535) Resonance
• Parity Doubling Among the Baryons
• Parity Doubling and SU(2)_L x SU(2)_R Restoration in the Hadron Spectrum
• Search for the possible S=+1 Pentaquark states in Quenched Lattice QCD
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