Negative contributions to S in an effective field theory

Details Negative contributions to S in an effective field theory Negative contributions to S in an effective field theory

1997-09-09

arxiv.org/abs/hep-ph/9709297v3

Phys.Lett. B416 (1998) 129-136

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 1 fig., LaTeX, typos corrected, improved referencing

Scientific paper

10.1016/S0370-2693(97)01304-X

We show that an effective field theory that includes non-standard couplings between the electroweak gauge bosons and the top and bottom quarks may yield negative contributions to both the S and T oblique radiative electroweak parameters. We find that that such an effective field theory provides a better fit to data than the standard model (the chi-squared per degree of freedom is half as large). We examine in some detail an illustrative model where the exchange of heavy scalars produces the correct type of non-standard couplings.

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