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arXiv 1102.4934hep-lathep-ph
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2+1味格点量子色动力学超子矢量耦合f_1(0)

Hyperon vector coupling f_1(0) from 2+1 flavor lattice QCD

Shoichi Sasaki

摘要:

本文给出了具有畴壁夸克的动力学格点量子色动力学中$Ξ^0 \rightarrow Σ^+ l\barν$和$Σ^- \rightarrow n l\barν$半轻子衰变的超子矢量形状因子f_1的结果。对RBC和UKQCD合作产生的2+1味规范配置进行了模拟,晶格截止值为1/a = 1.7 GeV。在最轻的海夸克质量(π介子质量低至约330 MeV)下计算的初步结果表明,SU(3)破缺对超子矢量耦合f_1(0)的二阶修正符号可能为负。

英文摘要:

We present results for the hyperon vector form factor f_1 for $Ξ^0 \rightarrow Σ^+ l\barν$ and $Σ^- \rightarrow n l\barν$ semileptonic decays from dynamical lattice QCD with domain-wall quarks. Simulations are performed on the 2+1 flavor gauge configurations generated by the RBC and UKQCD Collaborations with a lattice cutoff of 1/a = 1.7 GeV. Our preliminary results, which are calculated at the lightest sea quark mass (pion mass down to approximately 330 MeV), show that a sign of the second-order correction of SU(3) breaking on hyperon vector coupling f_1(0) is likely negative.

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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