6533b872fe1ef96bd12d3b18
RESEARCH PRODUCT
Unification of gauge couplings and the tau-neutrino mass in supergravity without R parity
Marco Aurelio DiazMarco Aurelio DiazJavier FerrandisJorge C. RomãoJose W.f. Vallesubject
PhysicsNuclear and High Energy PhysicsParticle physicsSupergravityHigh Energy Physics::PhenomenologyYukawa potentialFOS: Physical sciencesFísicaGauge (firearms)Renormalization groupSupersymmetry breakingHigh Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)R-parityTau neutrinoHigh Energy Physics::ExperimentNeutrino oscillationdescription
Minimal R-parity violating supergravity predicts a value for $alpha_s(M_Z)$ smaller than in the case with conserved R-parity, and therefore closer to the experimental world average. We show that the R-parity violating effect on the $alpha_s$ prediction comes from the larger two-loop b-quark Yukawa contribution to the renormalization group evolution of the gauge couplings which characterizes R-parity violating supergravity. The effect is correlated to the tau neutrino mass and is sensitive to the initial conditions on the soft supersymmetry breaking parameters at the unification scale. We show how a few percent effect on $alpha_s(M_Z)$ may naturally occur even with tau neutrino masses as small as indicated by the simplest neutrino oscillation interpretation of the atmospheric neutrino data from Super-Kamiokande.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1999-06-11 |