Effective operator contributions to the oblique parameters

Details Effective operator contributions to the oblique parameters Effective operator contributions to the oblique parameters

1998-05-18

arxiv.org/abs/hep-ph/9805366v1

Phys.Lett.B432:383-389,1998

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, RevTeX

Scientific paper

10.1016/S0370-2693(98)00682-0

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.

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