Nucleon isovector charges from physical mass domain-wall QCD.

S. Ohta
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引用次数: 1

Abstract

Systematics in nucleon isovector vector, $g_V$, and axialvector, $g_A$, charges calculated on a 2+1-flavor dynamical domain-wall-fermions (DWF) ensemble at physical mass jointly generated by RIKEN-BNL-Columbia (RBC) and UKQCD Collaborations with lattice cut off of 1.730(4) GeV, are analyzed. Both are calculated with about a percent or less statistical errors. A few standard-deviation systematics seen in vector charge is consistent with possible $O(a^2)$ discretization error through small excited-state contamination. Axialvector charge is found with three to nine standard-deviation systematic deficit, compared with experiments, depending on calculation methods.
物理质量域-壁QCD的核子等矢量电荷。
分析了由RIKEN-BNL-Columbia (RBC)和UKQCD共同生成的2+1味动态域-壁费米子(DWF)系综在点阵截断为1.730(4)GeV的情况下,核子等矢量矢量$g_V$和轴矢量$g_A$的系统电荷。两者的计算误差都在1%或更小。在矢量电荷中看到的一些标准偏差系统与通过小激发态污染可能产生的$O(A ^2)$离散误差是一致的。与实验相比,根据计算方法的不同,发现轴矢量电荷具有3到9个标准偏差的系统缺陷。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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