Search for resonant sneutrino production at sqrt(s) = 183 to 208 GeV

TL;DR

This paper reports a search for resonant sneutrino production in electron-positron collisions at energies between 183 and 208 GeV, finding no deviation from the Standard Model and setting limits on R-parity violating couplings.

Contribution

First search for resonant sneutrino production at these energies assuming specific R-parity violating couplings, providing new upper limits on these couplings as a function of sneutrino mass.

Findings

No deviation from the Standard Model observed.

Upper limits set on lambda_{121} and lambda_{131} couplings.

Limits are most stringent at energies with highest luminosity.

Abstract

Searches for resonant sneutrino 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.