Effect on Higgs Boson Decays from Large Light-Heavy Neutrino Mixing in Seesaw Models

Details Effect on Higgs Boson Decays from Large Light-Heavy Neutrino Mixing in Seesaw Models Effect on Higgs Boson Decays from Large Light-Heavy Neutrino Mixing in Seesaw Models

2010-01-28

arxiv.org/abs/1001.5215v2

Phys.Rev.D81:113004,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, 3 figures, with more discussion on experimental constraints and references, main conclusions unchanged, to match jou

Scientific paper

10.1103/PhysRevD.81.113004

In seesaw models with more than one generation of light and heavy neutrinos, nu and N, respectively, it is possible to have sizable mixing between them for heavy-neutrino masses of order 100 GeV or less. We explore this possibility further, taking into account current experimental constraints, and study its effect on Higgs-boson decays in the contexts of seesaw models of types I and III. We find that in the type-I case the Higgs decay into a pair of light and heavy neutrinos, h -> nu N, could increase the total Higgs width in the standard model by up to almost 30% for a relatively light Higgs-boson, which would significantly affect Higgs searches at the LHC. The subsequent prompt decay of N into three light fermions makes this Higgs decay effectively a four-body decay. We further find that, in the presence of the large light-heavy mixing, these four-body Higgs decays can have rates a few times larger than their standard-model counterparts and therefore could provide a potentially important window to reveal the underlying seesaw mechanism.

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