  The lepton number violating process $\mu\rightarrow e\gamma$ is used to study
the lepton number violating couplings in MSSM extended by terms violating
$R$-parity explicitly. Bounds are obtained for the products of $\lambda $- or
$\lambda '$-type couplings. It is found that many of these limits are more
stringent than the ones obtained previously.

High Energy Physics - Phenomenology