NOVEL SCALAR BOSON DECAYS IN SUSY WITH BROKEN R-PARITY

R-parity violation can induce mixing of the supersymmetric Higgs boson s with the sneutrinos at the tree level. We study the effect of this m ixing on the decays of Higgs scalars as well as sneutrinos in an effec tive model where the violation of R-parity is included in the minimal supersymmetric model through bilinear lepton number violating superpot ential terms. We show that a small violation of R-parity can lead to a sizeable branching ratio for the supersymmetric Higgs boson decay mod e H --> chi l (where chi denotes an electroweak gaugino and l is eithe r a tau neutrino or a tau lepton). Relevant constraints on R-parity vi olation as well as those coming from SUSY particle searches still allo w the decay H --> chi l to compete with the conventional decay H --> b (b) over bar, at least for some ranges of parameters of the model. Mo reover, the tau sneutrino will have dominant R-parity violating decays to standard model fermions b (b) over bar, tau(+)tau(-) or to the inv isible mode nu<(nu)over bar> whenever the phase space for R-parity con serving channels is closed.