Quantum Effects on Higgs-Boson Production and Decay due to Majorana Neutrinos
Abstract
We analyze the phenomenological implications for new electroweak physics in the Higgs sector in the framework of SU(2)L x U(1)Y theories that naturally predict heavy Majorana neutrinos. We calculate the one-loop Majorana-neutrino contributions to the decay rates of the Higgs boson into pairs of quarks and intermediate bosons and to its production cross section via bremsstrahlung in e+e- collisions. It turns out that these are extremely small in three- generation models. On the other hand, the sizeable quantum corrections generated by a conventional fourth generation with a Dirac neutrino may be screened considerably in the presence of a Majorana degree of freedom.
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