Quantum Effects on Higgs-Boson Production and Decay due to Majorana Neutrinos

Details Quantum Effects on Higgs-Boson Production and Decay due to Majorana Neutrinos Quantum Effects on Higgs-Boson Production and Decay due to Majorana Neutrinos

1994-02-18

arxiv.org/abs/hep-ph/9402314v1

Nucl.Phys. B424 (1994) 18-38

Physics

High Energy Physics

High Energy Physics - Phenomenology

27 p. (10 figs. available upon request), LaTeX, ISSN 0418-9833, DESY 94-020, RAL/94-021

Scientific paper

10.1016/0550-3213(94)90086-8

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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