The weak parity-violating pion-nucleon coupling

被引：55

作者：

Henley, EM

Hwang, WYP

Kisslinger, LS

机构：

[1] UNIV WASHINGTON,INST NUCL THEORY,HN 12,SEATTLE,WA 98195

[2] NATL TAIWAN UNIV,DEPT PHYS,TAIPEI 10764,TAIWAN

[3] CARNEGIE MELLON UNIV,DEPT PHYS,PITTSBURGH,PA 15213

来源：

PHYSICS LETTERS B | 1996年 / 367卷 / 1-4期

关键词：

parity-violation; weak pion-nucleon coupling; neutral currents; QCD sum rules;

D O I：

10.1016/0370-2693(95)01403-9

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We use QCD sum rules to obtain the weak parity-violating pion-nucleon coupling constant f(pi NN). We find that f(pi NN) approximate to 2 x 10(-8), about an order of magnitude smaller than the ''best estimates'' based on quark models. This result follows from the cancellation between perturbative and nonperturbative QCD processes not found in quark models, but explicit in the QCD sum rule method. Our result is consistent with the experimental upper limit found from F-18 parity-violating measurements.

引用

页码：21 / 27

页数：7

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