Making the sneutrino a Higgs particle with a U(1) R lepton number
We present a supersymmetric extension of the Sstandard model that possesses a continuous U(1) R symmetry, which is identified with one of three lepton numbers, and where a sneutrino vev gives mass to the down-type quark and leptons. This idea allows for a smaller particle content than the minimal R-symmetric supersymmetry extension of the standard model. We explore bounds on this model coming from electroweak precision measurements, neutrino masses, and gravitino decay. Bounds from electroweak precision measurements lead to a two-sided bound on tanβ, while gravitino decay forces a low reheating temperature. Finally, the generation of neutrino masses from R-symmetry violation put an upper bound on the SUSY-breaking scale. Despite all of this, we find that the allowed parameter space is still large and would lead to a distinctive phenomenology at the LHC.
|Journal||Physical Review D - Particles, Fields, Gravitation and Cosmology|
Frugiuele, C. (Claudia), & Gregoire, T. (2012). Making the sneutrino a Higgs particle with a U(1) R lepton number. Physical Review D - Particles, Fields, Gravitation and Cosmology, 85(1). doi:10.1103/PhysRevD.85.015016