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

被引：9

作者：

Geng, Li-Sheng ^{[1
,2
]}

Li, Kai-Wen ^{[1
,2
]}

Camalich, J. Martin ^{[3
,4
]}

机构：

[1] Beihang Univ, Sch Phys & Nucl Energy Engn, Beijing 100191, Peoples R China

[2] Beihang Univ, Int Res Ctr Particles & Nuclei Cosmos, Beijing 100191, Peoples R China

[3] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA

[4] Johannes Gutenberg Univ Mainz, PRISMA Cluster Excellence Inst Kernphys, D-55128 Mainz, Germany

来源：

PHYSICAL REVIEW D | 2014年 / 89卷 / 11期

基金：

中国国家自然科学基金;

关键词：

NONRENORMALIZATION THEOREM; PERTURBATION-THEORY; SU(3) BREAKING; LATTICE QCD; BETA-DECAY; MASS; NUCLEON; MODEL;

D O I：

10.1103/PhysRevD.89.113007

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

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(pi)L = 4.6, but chiral extrapolation needs to be performed more carefully. Nevertheless, the discrepancy remains, and further studies are needed to fully understand it.

引用

页数：11

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