Radiative decay of the lightest neutralino in an R-parity violating supersymmetric theory

Abstract

In an R-parity violating supersymmetric scenario, the lightest neutralino ${\tilde{\chi }}_1^0$ is no longer a stable particle. We calculate the branching ratio for the decay mode ${\tilde{\chi }}_1^0⟶\nu \gamma$ which occurs at the one-loop level. Taking into account bilinear as well as trilinear lepton number violating interactions as the sources of R-parity violation, we make a detailed scan of the parameter space, both with and without gaugino mass unification and including the constraints on the neutrino sector from the recent Superkamiokande results. This study enables one to suggest interesting experimental signals distinguishing between the two types of R-parity breaking, and also to ascertain whether such radiative decays can give rise to collider signals of the type $\gamma \gamma$ + $/\mathrm{E}$ from pair-produced neutralinos.

25 pages, LaTex including postscript figures. Uses axodraw.sty. Minor typographic errors corrected

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• Neutral Higgs Sector of the MSSM without $R_p$
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• Spontaneous R-Parity violation bounds
• Decays of a bino-like particle in the low-mass regime
• New scalar resonances from sneutrino-Higgs mixing in supersymmetry with small lepton number (R-parity) violation
• R-Parity Violating Supersymmetry and the 125 GeV Higgs signals
• 3- and 2-body supersymmetric processes: predictions, challenges and prospectives
• Indian Contributions to LHC Theory
• R-parity Violating Radiative Photino Decay in Supersymmetric Models