Search for resonant $\tilde\nu$ production at $\sqrt{s} =$ 183 to 208 GeV

Abstract.

Searches for resonant $\tilde\nu$ production in e ⁺ e ^- collisions under the assumption that R-parity is not conserved and that the dominant R-parity violating coupling is $\lambda_{121}$ or $\lambda_{131}$ used data recorded by DELPHI in 1997 to 2000 at centre-of-mass energies of 183 to 208 GeV. No deviation from the Standard Model was observed. Upper limits are given for the $\lambda_{121}$ and $\lambda_{131}$ couplings as a function of the sneutrino mass and total width. The limits are especially stringent for sneutrino masses equal to the centre-of-mass energies with the highest integrated luminosities recorded.