MASS SINGULARITIES IN LIGHT-QUARK CORRELATORS - THE STRANGE QUARK CASE

被引：77
|
作者：
CHETYRKIN, KG
DOMINGUEZ, CA
PIRJOL, D
SCHILCHER, K
机构：
[1] UNIV CAPE TOWN,INST THEORET PHYS & ASTROPHYS,RONDEBOSCH 7700,SOUTH AFRICA
[2] UNIV MAINZ,INST PHYS,D-55099 MAINZ,GERMANY
来源：
PHYSICAL REVIEW D | 1995年 / 51卷 / 09期
关键词：
D O I：
10.1103/PhysRevD.51.5090
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The correlators of light-quark currents contain mass singularities of the form ln(m2/Q2). It has been known for quite some time that these mass logarithms can be absorbed into the vacuum expectation values of other operators of appropriate dimension, provided that schemes without normal ordering are used. We discuss in detail this procedure for the case of the mass logarithms m4ln(m2/Q2), including also the mixing with the other dimension-4 operators to two-loop order. As an application we present an improved QCD sum rule determination of the strange-quark mass. We obtain m̄s(1 GeV)=171±15 MeV. © 1995 The American Physical Society.
引用
收藏
页码：5090 / 5100
页数：11
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