Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2008-01-30
Phys.Rev.D78:011503,2008
Physics
High Energy Physics
High Energy Physics - Lattice
5pages, 3 figures, 1 table; Confusing notations were corrected. (v2); Results on N(1650) were added. (v3)
Scientific paper
10.1103/PhysRevD.78.011503
We show the first lattice QCD results on the axial charge $g_A^{N^*N^*}$ 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. In order to properly separate signals of $N^*(1535)$ and $N^*(1650)$, 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 $N^*(1535)$ takes small values as $g_A^{N^*N^*}\sim {\mathcal O}(0.1)$, whereas that of $N^*(1650)$ is about 0.5, which is found independent of quark masses and consistent with the predictions by the naive nonrelativistic quark model.
Kunihiro Teiji
Takahashi Toru T.
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