Neutralino Phenomenology at LEP2 in Supersymmetry with Bilinear Breaking   of R-parity
  We discuss the phenomenology of the lightest neutralino in models where an effective bilinear term in the superpotential parametrizes the explicit breaking of R-parity. We consider supergravity scenarios where the lightest supersymmetric particle (LSP) is the lightest neutralino and which can be explored at LEP2. We present a detailed study of the LSP decay properties and general features of the corresponding signals expected at LEP2. We also contrast our model with gauge mediated supersymmetry breaking. 
A. Bartl, W. Porod, D. Restrepo, J. Romao, and J.W.F. Valle