GAUGE DEPENDENCE OF THE W-BOSON CONTRIBUTION TO (ALPHA)OVER-BAR=ALPHA(M(Z))

Authors
NEVZOROV RB NOVIKOV AV
Citation
Rb. Nevzorov et Av. Novikov, GAUGE DEPENDENCE OF THE W-BOSON CONTRIBUTION TO (ALPHA)OVER-BAR=ALPHA(M(Z)), Physics of atomic nuclei, 59(3), 1996, pp. 511-523
Citations number
15
Categorie Soggetti
Physics, Nuclear","Physics, Particles & Fields
Journal title
Physics of atomic nuclei → ACNP
ISSN journal
10637788
Volume
59
Issue
3
Year of publication
1996
Pages
511 - 523
Database
ISI
SICI code
1063-7788(1996)59:3<511:GDOTWC>2.0.ZU;2-Y
Abstract
It is shown that the contribution delta alpha(W) of the W-boson loop t o <(alpha) over bar> depends on the gauge parameter xi. The cases of t he Feynman and Landau gauges (xi = 1 and xi = 0, respectively) are tre ated separately. The imaginary part of the polarization operator is co nsidered as a function of the gauge parameter. It is verified that phy sical quantities (such as m(Z)(2) and the amplitude of heavy-lepton sc attering) are independent of the gauge parameter xi.