Higgs coupling constants as a probe of new physics

Details Higgs coupling constants as a probe of new physics Higgs coupling constants as a probe of new physics

2004-08-31

arxiv.org/abs/hep-ph/0408364v2

Phys.Rev. D70 (2004) 115002

Physics

High Energy Physics

High Energy Physics - Phenomenology

52 pages, 10 figures, revtex4

Scientific paper

10.1103/PhysRevD.70.115002

We study new physics effects on the couplings of weak gauge bosons with the lightest CP-even Higgs boson ($h$), $hZZ$, and the tri-linear coupling of the lightest Higgs boson, $hhh$, at the one loop order, as predicted by the two Higgs doublet model. Those renormalized coupling constants can deviate from the Standard Model (SM) predictions due to two distinct origins; the tree level mixing effect of Higgs bosons and the quantum effect of additional particles in loop diagrams. The latter can be enhanced in the renormalized $hhh$ coupling constant when the additional particles show the non-decoupling property. Therefore, even in the case where the $hZZ$ coupling is close to the SM value, deviation in the $hhh$ coupling from the SM value can become as large as plus 100 percent, while that in the $hZZ$ coupling is at most minus 1 percent level. Such large quantum effect on the Higgs tri-linear coupling is distinguishable from the tree level mixing effect, and is expected to be detectable at a future linear collider.

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