| Axial charges of N（1535） and N（1650） in two-flavor lattice QCD |
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| 作者姓名： | Toru T. Takahashi Teiji Kunihiro |
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| 作者单位： | 1. Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502,Japan;2. Department of Physics, Kyoto University, Kyoto 606-8502, Japan; |
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| 基金项目： | Supported by a Grant-in-Aid for Scientific research by Monbu-Kagakusho （17540250, 20028006, 20540265）, grant-in-Aid for the global COE program ＂The Next Generation of Physics, Spun from Universality and Emergence＂ from MEXT, Kyoto University and Yukawa International Program for Quark-Haziron Sciences （YIPQS） All the numerical calculations were performed on NEC SX-8R at RCNP and CMC, Osaka University, on SX-8 at YITP, Kyoto University, and on Blue- Gene at KEK. The unquenched gauge configurations employed in our analysis were all generated by CP- PA CS collaboration |
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| 摘 要： | We show the lattice QCD results on the axial charge gAN＊-N＊ of negative parity nucleon resonances, N＊（1535） and N＊（1650）, which are key clues to the chiral structure in baryon sector. The measurements are performed with up and down dynamical quarks employing the renormalization-group improved gauge action at β=1.95 and the O（a） improved clover quark action with the hopping parameters, κ=0.1375, 0.1390 and 0.1400. In order to properly separate signals of N＊ （1535） and N＊ （1650）, we construct 2 × 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 gAN＊N＊-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.
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| 关 键 词： | 量子色动力学 相对论夸克模型 晶格 收费 风味 轴 手性结构 重整化群 |
| 收稿时间： | 2009-8-7 |
Axial charges of N（1535） and N（1650） in two-flavor lattice QCD |
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| Toru T. Takahashi,Teiji Kunihiro.Axial charges of N（1535） and N（1650） in two-flavor lattice QCD[J].High Energy Physics and Nuclear Physics,2009,33(12):1233-1237. |
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| Authors: | 《Chinese Physica C》 |
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| Abstract: | axial charge, chiral symmetry, negative parity nucleon |
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| Keywords: | axial charge chiral symmetry negative parity nucleon |
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