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arXiv 1402.7133hep-phhep-exhep-latnucl-th
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超子矢量耦合的手征外推和有限体积依赖

Chiral extrapolation and finite-volume dependence of the hyperon vector couplings

Li-Sheng Geng, Kai-wen Li, J. Martin Camalich

摘要:

零动量转移时的超子矢量形状因子$f_1(0)$在精确确定Cabibbo-Kobayashi-Maskawa矩阵元$V_{us}$中起着重要作用。最近的研究基于晶格色动力学(LQCD)模拟和协变重子手征微扰理论产生矛盾的结果。在这项工作中,我们研究手征外推和有限体积修正的最新$n_f=2+1$ LQCD模拟。我们的结果表明,有限体积修正相对较小,可以安全地忽略在目前的LQCD设置的$m_πL=4.6$,但手征外推需要更仔细地进行。然而,这种差异仍然存在,需要进一步研究才能充分理解。

英文摘要:

The hyperon vector form factors at zero momentum transfer, $f_1(0)$, play an important role in a precise determination of the Cabibbo-Kobayashi-Maskawa matrix element $V_{us}$. Recent studies based on lattice chromodynamics (LQCD) simulations and covariant baryon chiral perturbation theory yield contradicting results. In this work, we study chiral extrapolation of and finite-volume corrections to the latest $n_f=2+1$ LQCD simulations. Our results show that finite-volume corrections are relatively small and can be safely ignored at the present LQCD setup of $m_πL=4.6$ but chiral extrapolation needs to be performed more carefully. Nevertheless, the discrepancy remains and further studies are needed to fully understand it.

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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