Scalar neutrino production in R-parity violating supersymmetric model at   HERA
  We investigate a single scalar neutrino production at the upgraded HERA with high luminosity in the framework of an R-parityviolating supersymmetric model. We find that the scalar neutrino with mass around 100GeV could be observed through investigating the multilepton production process e- p -> mu- sneutrino(tau) X -> mu- (e- mu+) X. The signal would be characterized by mu+ and e- with high transverse momentum as well as a sharp peak in the invariant mass M(e-,mu+) distribution. 
Tadashi Kon, Jun-ichi Kamoshita, Tetsuro Kobayashi, Shoichi Kitamura   and Yoshimasa Kurihara