A general treatment of oblique parameters

Kundu, Anirban ; Roy, Probir (1997) A general treatment of oblique parameters International Journal of Modern Physics A, 12 (8). pp. 1511-1529. ISSN 0217-751X

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Official URL: http://www.worldscinet.com/ijmpa/12/1208/S0217751X...

Related URL: http://dx.doi.org/10.1142/S0217751X97001079


A re-examination is made of one-loop oblique electroweak corrections. General definitions are given of the oblique parameters without reference to any q2 expansion scheme. The old oblique parameters S, T and U are defined as differences of gauge boson vacuum polarization Π functions and suffice for describing certain observable ratios on the Z peak and the ρ parameter at q2 = 0. Regarding the new oblique parameters V, W and X, the first two are defined in terms of differences of Π functions as well as the wave function renormalization of the corresponding weak boson, and the third in terms of the difference of differences of two Π functions for γ - 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.

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