ON GAUGE-INVARIANCE OF BREIT-WIGNER PROPAGATORS

Authors
NOWAKOWSKI M PILAFTSIS A
Citation
M. Nowakowski et A. Pilaftsis, ON GAUGE-INVARIANCE OF BREIT-WIGNER PROPAGATORS, Zeitschrift fur Physik. C, Particles and fields, 60(1), 1993, pp. 121-125
Citations number
36
Categorie Soggetti
Physics, Particles & Fields
Journal title
Zeitschrift fur Physik. C, Particles and fields → ACNP
ISSN journal
01709739
Volume
60
Issue
1
Year of publication
1993
Pages
121 - 125
Database
ISI
SICI code
0170-9739(1993)60:1<121:OGOBP>2.0.ZU;2-7
Abstract
We present an approach to bosonic (Z0, W+/-) as well as fermionic (top -quark) Breit-Wigner propagators which is consistent with gauge invari ance arguments. In particular, for the Z0-boson propagator we extend p revious analyses and show that the part proportional to k(mu)k(nu)/M2 must be modified near the resonance. We derive a mass shift which agre es with results obtained elsewhere by different methods. The modified form of a resonant heavy fermion propagator is also given.