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arXiv 1209.6115hep-lathep-ph
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2+1味格点量子色动力学的超子矢量形状因子

Hyperon vector form factor from 2+1 flavor lattice QCD

Shoichi Sasaki

摘要:

给出了全动力学格点量子色动力学中Xi^0 -> Sigma^+ l bar{nu}和Sigma^- -> nl bar{nu}半轻子衰变的超子矢量形状因子f_1的第一个结果.的计算进行与规范配置的RBC和UKQCD合作产生的(2+1)口味的动态域壁费米子和岩崎规范作用在β =2.13,对应于截止1/a=1.73 GeV。我们的计算结果表明,SU(3)破缺对超子矢量耦合f_1(0)的二阶修正符号为负。本文所观察到的SU(3)破缺修正的趋势与最新的重子手征微扰理论结果和大N_c分析的预言都不一致。

英文摘要:

We present the first result for the hyperon vector form factor f_1 for Xi^0 -> Sigma^+ l bar{nu} and Sigma^- -> n l bar{nu} semileptonic decays from fully dynamical lattice QCD. The calculations are carried out with gauge configurations generated by the RBC and UKQCD collaborations with (2+1)-flavors of dynamical domain-wall fermions and the Iwasaki gauge action at beta=2.13, corresponding to a cutoff 1/a=1.73 GeV. Our results, which are calculated at the lighter three sea quark masses (the lightest pion mass down to approximately 330 MeV), show that a sign of the second-order correction of SU(3) breaking on the hyperon vector coupling f_1(0) is negative. The tendency of the SU(3) breaking correction observed in this work disagrees with predictions of both the latest baryon chiral perturbation theory result and large N_c analysis.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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