6533b85afe1ef96bd12b8d90
RESEARCH PRODUCT
SINGLE PHOTON DECAYS OF THE $Z^0$ AND SUSY WITH SPONTANEOUSLY BROKEN R-PARITY
Jorge C. RomãoJanusz RosiekJose W.f. Vallesubject
PhysicsNuclear and High Energy PhysicsParticle physicsElectroweak interactionHigh Energy Physics::PhenomenologyFOS: Physical sciencesFísicaSupersymmetryMassless particlePseudoscalarHigh Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)R-parityGoldstone bosonHigh Energy Physics::ExperimentBosonMajorondescription
Spontaneous violation of R parity can induce rare single photon decays of the $Z^0$ involving the emission of (nearly) massless pseudoscalar Goldstone bosons, majorons, as well as massive CP even or CP odd spin zero bosons that arise in the electroweak breaking sector of these models. We show that the majoron emitting decays can have a sizeable branching ratio of $10^{-5}$ or so, without conflicting any experimental observation from neutrino physics or particle searches. These decays may lead to interesting structures for the single photon spectrum involving either mono chromatic photons as well as continuous spectra that grow with energy. They would easily account for an excess of single photon events at high energies recently hinted at by the OPAL collaboration.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1995-02-01 |