Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-06-27
Phys.Rev.D64:115011,2001
Physics
High Energy Physics
High Energy Physics - Phenomenology
Revised discussion of sneutrino dark matter, 29 pages
Scientific paper
10.1103/PhysRevD.64.115011
An alternative to the conventional see-saw mechanism is proposed to explain the origin of small neutrino masses in supersymmetric theories. The masses and couplings of the right-handed neutrino field are suppressed by supersymmetry breaking, in a way similar to the suppression of the Higgs doublet mass, $\mu$. New mechanisms for light Majorana, Dirac and sterile neutrinos arise, depending on the degree of suppression. Superpartner phenomenology is greatly altered by the presence of weak scale right-handed sneutrinos, which may have a coupling to a Higgs boson and a left-handed sneutrino. The sneutrino spectrum and couplings are quite unlike the conventional case - the lightest sneutrino can be the dark matter and predictions are given for event rates at upcoming halo dark matter direct detection experiments. Higgs decays and search strategies are changed. Copious Higgs production at hadron colliders can result from cascade decays of squarks and gluinos.
Arkani-Hamed Nima
Hall Lawrence
Murayama Hitoshi
Smith David
Weiner Neal
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