Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-03-15
Int.J.Mod.Phys. A12 (1997) 1511-1530
Physics
High Energy Physics
High Energy Physics - Phenomenology
LaTex file. This work is a descendant of an earlier paper circulated as hep-ph/9411225 which has been withdrawn
Scientific paper
10.1142/S0217751X97001079
A reexamination is made of one-loop oblique electroweak corrections. General definitions are given of the oblique parameters without reference to any $q^2$-expansion scheme. The old oblique parameters S,T and U are defined as differences of gauge boson vacuum polarization $\Pi$-functions and suffice to describe certain observable ratios on the Z-peak and the $\rho$ parameter at $q^2=0$. Regarding the new oblique parameters V,W and X, the first two are defined in terms of differences of $\Pi$-functions as well as the wavefunction renormalization of the corresponding weak boson, and the third in terms of the difference of differences of two $\Pi$-functions for $\gamma-Z$ mixing. Explicit expressions for measurable quantities involving all six oblique parameters are given and experimental bounds are obtained on the latter, some for the first time. A review of these constraints suggests that the linear approximation of Peskin and Takeuchi is robust.
Kundu Anirban
Roy Probir
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