DOI 10.1007/s100529900226
Search for R-parity violating decays of scalar fermions at LEP
The OPAL Collaboration
G.Abbiendi
- et al.
2 Dipartimento di Fisica dell' Università di Bologna and INFN,
40126 Bologna, Italy
Received: 16 March 1999 / Published online: 14 October 1999
Abstract
A search for pair produced scalar fermions with couplings
that violate R-parity has been performed
using a data sample corresponding to an integrated luminosity of
56 pb-1 at a centre-of-mass energy of 
183 GeV
collected with the OPAL detector at LEP.
An important consequence of R-parity breaking interactions is that
the lightest supersymmetric particle is expected to be unstable.
Searches for R-parity violating decays of charged sleptons,
sneutrinos and stop quarks have been
performed under the assumptions that the
lightest supersymmetric particle decays promptly and that only one of
the R-parity violating couplings is dominant for each of the decay
modes considered. Such processes would yield multi-leptons,
jets plus leptons or multi-jets, with
or without
missing energy, in the final state.
No significant excess of such events has been observed.
Limits on the production cross-sections of
scalar fermions in R-parity violating scenarios are obtained.
Mass exclusion regions are also presented in the framework
of the Constrained Minimal Supersymmetric Standard Model.
Copyright Springer-Verlag 2000
