Effective operator contributions to the oblique parameters

We present a model and process independent study of the contributions from non-Standard Model physics to the oblique parameters S, T and U. We show that within an effective lagrangian parameterization the expressions for the oblique parameters in terms of observables are consistent, while those in t...

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Bibliographic Details
Published inPhysics letters. B Vol. 432; no. 3; pp. 383 - 389
Main Authors Sánchez-Colón, G., Wudka, J.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 30.07.1998
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Summary:We present a model and process independent study of the contributions from non-Standard Model physics to the oblique parameters S, T and U. We show that within an effective lagrangian parameterization the expressions for the oblique parameters in terms of observables are consistent, while those in terms of the vector-boson vacuum polarization tensors are ambiguous. We obtain the constraints on the scale of new physics derived from current data on S, T and U and note that deviations in U from its Standard Model value would favor a scenario where the underlying physics does not decouple.
ISSN:0370-2693
1873-2445
DOI:10.1016/S0370-2693(98)00682-0