Quantum Effects on Higgs-Boson Production and Decay due to Majorana Neutrinos
B. A. Kniehl, A. Pilaftsis
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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