Hyperon vector form factor from 2+1 flavor lattice QCD

被引：15

作者：

Sasaki, Shoichi ^{[1
]}

机构：

[1] Tohoku Univ, Dept Phys, Sendai, Miyagi 9808578, Japan

来源：

PHYSICAL REVIEW D | 2012年 / 86卷 / 11期

关键词：

SU(3) BREAKING; BETA-DECAY; MODEL;

D O I：

10.1103/PhysRevD.86.114502

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the first result for the hyperon vector form factor f(1) for Xi(0) -> Sigma(+)l (v) over bar and Sigma(=)-> nl (v) over bar 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 a(-1) = 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.

引用

页数：7

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