Lepton-flavor-violating decaysL→lγγas a new probe of supersymmetry with brokenRparity

Abstract

Lepton-flavor-violating decays of the type $\stackrel{\ensuremath{\rightarrow}}{L}l\ensuremath{\gamma}\ensuremath{\gamma}$ $(\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\mu}}e\ensuremath{\gamma}\ensuremath{\gamma},$ $\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\tau}}e\ensuremath{\gamma}\ensuremath{\gamma},$ and $\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\tau}}\ensuremath{\mu}\ensuremath{\gamma}\ensuremath{\gamma})$ are proposed as new probes of R-parity-violating supersymmetry. Non-penguin diagrams with a sneutrino that decays into two photons via a triangle graph might trigger such decays even in the absence of the corresponding radiative decays into one photon only, e.g. $\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\mu}}e\ensuremath{\gamma}.$ Thus, processes of the type $\stackrel{\ensuremath{\rightarrow}}{L}l\ensuremath{\gamma}\ensuremath{\gamma}$ may provide an independent probe of new flavor physics.