Triviality and the Precision Bound on the Higgs Mass

Details Triviality and the Precision Bound on the Higgs Mass Triviality and the Precision Bound on the Higgs Mass

1999-07-19

arxiv.org/abs/hep-ph/9907414v1

Phys.Lett. B464 (1999) 244-248

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, 3 epsf figures included

Scientific paper

10.1016/S0370-2693(99)00972-7

The triviality of the scalar sector of the standard one-doublet Higgs model implies that this model is only an effective low-energy theory valid below some cut-off scale Lambda. For a heavy higgs this scale must be relatively low (10 TeV or less). Additional interactions coming from the underlying theory, and suppressed by the scale Lambda, give rise to model-dependent corrections to precisely measured electroweak quantities. Dimension six operators arising from the underlying physics naturally contribute to the S and T parameters, and their effects should be included in a global fit to the precision data that determines any limit on the Higgs mass. Using dimensional analysis, we estimate the expected size of these corrections in a custodially-symmetric strongly-interacting underlying theory. Taking these operators' coefficients to be of natural size gives sufficiently large contributions to the T parameter to reconcile Higgs masses as large as 400-500 GeV with the precision data.

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