LHC signatures of neutrino mass generation through R-parity violation

Abstract

We consider a model of neutrino mass based on R-parity violating (RPV) supersymmetry, with three ${\mu }_i$, relevant for bilinear RPV terms, and three ${\lambda }_{ijk}^{\prime }$, relevant for the trilinear terms. The present neutrino data, after a precise determination of the mixing angle ${\theta }_{13}$, severely constrain such models. We make a thorough study of one such class of models that may have interesting signatures at the upgraded LHC. In this class of models, the relevant trilinear couplings are of the form ${\lambda }_{i33}^{\prime }$, so if the lighter stop squark ${\tilde{t}}_1$ is the lightest supersymmetric particle (LSP), it will decay only through these couplings, giving rise to events with isolated hard leptons and jets. Even when ${\tilde{t}}_1$ is the next-to-LSP (NLSP), it can decay via the tiny ${\lambda }^{\prime }$ couplings allowed by the neutrino data, although it may face stiff competition from some R-parity conserving decay modes. Using a simple Pythia based simulation, we find that in both the cases the signal consisting of a pair of oppositely charged leptons ($ee$, $\mu \mu$ or $e\mu$) plus jets may be observable at the upgraded LHC experiments for a reasonable range of the ${\tilde{t}}_1$ mass.

16 pages, 4 embedded eps figures. v2: Minor modifications, discussions on neutrino mass matrix and backgrounds added. All results unchanged. Version to appear in Phys. Rev. D

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