Lightest Higgs Boson Mass in Split Supersymmetry with See-saw Mechanism

Details Lightest Higgs Boson Mass in Split Supersymmetry with See-saw Mechanism Lightest Higgs Boson Mass in Split Supersymmetry with See-saw Mechanism

2004-12-21

arxiv.org/abs/hep-ph/0412315v2

Phys.Rev.D71:111701,2005

Physics

High Energy Physics

High Energy Physics - Phenomenology

minor changes, version in PRD(Rapid Communication)

Scientific paper

10.1103/PhysRevD.71.111701

In the minimal supersymmetric standard model extended by including right-handed neutrinos with see-saw mechanism, the neutrino Yukaka couplings can be as large as the top-quark Yukawa couplings and thus the neutrino/sneutrino may cause sizable effects in Higgs boson self-energy loops. Our explicit one-loop calculations show that the neutrino/sneutrino effects may have an opposite sign to top/stop effects and thus lighten the lightest Higgs boson. If the soft-breaking mass of the right-handed neutrino is very large (at the order of Majorana mass scale), such as in the split-SUSY scenario, the effects can lower the lightest Higgs boson mass by a few tens of GeV. So the Higgs mass bound of about 150 GeV in split-SUSY may be lowered significantly if right-handed neutrinos come into play with see-saw mechanism.

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