Effective operator contributions to the oblique parameters
arXiv:hep-ph/9805366 · doi:10.1016/S0370-2693(98)00682-0
Abstract
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.
13 pages, RevTeX
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