FINITE-WIDTH EFFECTS AND GAUGE-INVARIANCE IN RADIATIVE-W PRODUCTION AND DECAY

被引：98

作者：

BAUR, U ^{[1
]}

ZEPPENFELD, D ^{[1
]}

机构：

[1] UNIV WISCONSIN, DEPT PHYS, MADISON, WI 53706 USA

来源：

PHYSICAL REVIEW LETTERS | 1995年 / 75卷 / 06期

关键词：

D O I：

10.1103/PhysRevLett.75.1002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The naive implementation of finite width effects in processes involving unstable particles can violate gauge invariance. For the example of radiative W production and decay, q (q) over bar(1) --> l nu gamma, at tree level, it is demonstrated how gauge invariance is restored by including the imaginary part of triangle graphs in addition to resumming the imaginary contributions to the W vacuum polarization. Monte Carlo results are presented for the Fermilab Tevatron.

引用

页码：1002 / 1005

页数：4

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