New Production Mechanism of Neutral Higgs Bosons with Right scalar tau neutrino as the LSP

Motived by the neutrino oscillation data, we consider the lightest tau sneutrino ν̃τ1 (which is mostly the right tau sneutrino) to be the lightest supersymmetric particle (LSP) in the framework of the minimal supersymmetric Standard Model. Both the standard and the non-standard trilinear scalar coupling terms are included for the right tau sneutrino interactions. The decay branching ratio of ν̃τ2 → ν̃τ1 +h0 can become so large that the production rate of the lightest neutral Higgs boson (h0) can be largely enhanced at electron or hadron colliders, either from the direct production of ν̃τ2 or from the decay of charginos, neutralinos, sleptons, and the cascade decay of squarks and gluinos, etc. Furthermore, because of the small LSP annihilation rate, ν̃τ1 can be a good candidate for cold dark matter. PACS number(s): 12.60.Jv, 14.80.Cp, 14.80.Ly, 14.60.St