R parity violation can induce mixing of the supersymmetric Higgs bosons with the sneutrinos at the tree level. We study the effect of this mixing on the decays of Higgs scalars as well as sneutrinos in an effective model where the violation of R parity is included in the minimal supersymmetric model through bilinear lepton number violating superpotential terms. We show that a small violation of R parity can lead to a sizeable branching ratio for the supersymmetric Higgs boson decay mode H → χℓ (where χ denotes an electroweak gaugino and ℓ is either a tau neutrino or a tau lepton). Relevant constraints on R parity violation as well as those coming from SUSY particle searches still allow the decay H → χℓ to compete with the conventional decay H → bb, at least for some ranges of parameters of the model. Moreover, the tau sneutrino will have dominant R parity violating decays to standard model fermions bb, τ + τ − or to the invisible mode νν whenever the phase space for R parity conserving channels is closed. *
We consider the charged scalar boson phenomenology in the simplest effective low-energy R-parity breaking model characterized by a bilinear violation of R-parity in the superpotential. This induces a mixing between staus and the charged Higgs boson. We show that the charged Higgs boson mass can be lower than expected in the MSSM, even before including radiative corrections. We also study the charged scalar boson decay branching ratios and show that the R-parity violating decay rates can be comparable or even bigger than the R-parity conserving ones. Moreover, if the stau is the LSP it will have only decays into standard model fermions. These features could have important implications for charged supersymmetric scalar boson searches at future accelerators.
We perform a careful study of the neutral scalar sector of a model which includes a singlet, a doublet, and a triplet scalar field under SU(2). This model is motivated by neutrino physics, since it is simply the most general version of the seesaw model of neutrino mass generation through spontaneous violation of lepton number. The neutral Higgs sector contains three CP-even and one massive CP-odd Higgs boson A, in addition to the massless CP-odd majoron J. The weakly interacting majoron remains massless if the breaking of lepton number symmetry is purely spontaneous. We show that the massive CP-odd Higgs boson may invisibly decay to three majorons, as well as to a CP-even Higgs H boson plus a majoron. We consider the associated Higgs production e + e − → Z → HA followed by invisible decays A → JJJ and H → JJ and derive the corresponding limits on masses and coupling that follow from LEP I precision measurements of the invisible Z width. We also study a novel bbbbp / T signal predicted by the model, analyse the background and perform a Monte-Carlo simulation of the signal in order to illustrate the limits on Higgs boson mass, couplings and branching ratios that follow from
In the simplest scheme for neutrino masses invoking a triplet of Higgs scalars there are two CP-even neutral Higgs bosons H i (iϭ1,2) and one massive pseudoscalar A. For some choices of parameters, the lightest H 1 may be lighter than the standard model Higgs boson. If the smallness of the neutrino mass is due to the small value of the triplet expectation value, as expected in a seesaw scheme, the Higgs bosons may decay dominantly to the invisible neutrino channel. We derive limits on Higgs boson masses and couplings that follow from CERN LEP I precision measurements of the invisible Z width. ͓S0556-2821͑98͒01917-1͔PACS number͑s͒: 14.80. Cp, 13.85.Qk, 14.60.Pq Neutrino mass constitutes one of the deepest open issues in the standard model ͑SM͒ of particle physics, which now finds some observational support ͓1͔. Neutrino masses in the few eV range may also be crucial in explaining the large scale structure of the universe. In many SU(2) U(1) extensions of the SM neutrino masses are generated from the spontaneous violation of a global lepton number symmetry leading to the existence of a physical Goldstone boson -the Majoron ͓2͔. In such models the Majoron acts as the tracer of the neutrino mass generation mechanism and may have, depending on the details of the model, many interesting phenomenological implications ͓3͔. If the breaking of lepton number occurs at the weak scale the lightest Higgs boson can decay dominantly into the weakly interacting majorons ͓4͔. Since these escape detection, this decay is called invisible and has as signature missing momentum in the reaction.Here we consider a more direct way in which neutrino mass physics can show up as a missing momentum Higgs boson signature. As our illustrative model we consider the simplest triplet model for generating neutrino masses as first proposed, in the majoron-less form ͓5͔. The model contains a complex SU͑2͒ triplet of scalar bosons ⌬, in addition to the standard Higgs doublet
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