Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2009-11-13
Nucl.Phys.Proc.Suppl.186:113-116,2009
Physics
High Energy Physics
High Energy Physics - Lattice
4 pages, 2 figures, presented at the 14th High-Energy Physics International Conference on Quantum ChromoDynamics (QCD08) Montp
Scientific paper
10.1016/j.nuclphysbps.2008.12.02
We show the first lattice QCD results on the axial charges $g_A^{N^*N^*}$ of $N^*(1535)$ and $N^*(1650)$. 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. We construct 2$\times$2 correlation matrices and diagonalize them so that the signals of $N^*(1535)$ and $N^*(1650)$ are properly separated. 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. The axial charge of $N^*(1535)$ is found to take small values as $g_A^{N^*N^*}\sim {\mathcal O}(0.1)$, whereas that of $N^*(1650)$ is approximately 0.5, which is almost independent of quark masses and consistent with the predictions by the naive nonrelativistic quark model.
Kunihiro Teiji
Takahashi Toru T.
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