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

Authors
BAUR U ZEPPENFELD D
Citation
U. Baur et D. Zeppenfeld, FINITE-WIDTH EFFECTS AND GAUGE-INVARIANCE IN RADIATIVE-W PRODUCTION AND DECAY, Physical review letters, 75(6), 1995, pp. 1002-1005
Citations number
22
Categorie Soggetti
Physics
Journal title
Physical review letters → ACNP
ISSN journal
00319007
Volume
75
Issue
6
Year of publication
1995
Pages
1002 - 1005
Database
ISI
SICI code
0031-9007(1995)75:6<1002:FEAGIR>2.0.ZU;2-G
Abstract
The naive implementation of finite width effects in processes involvin g 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 in cluding 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.