DOI: 10.1140/epjc/s2003-01466-y
Search for anomalous production of
di-lepton events with missing transverse momentum
in
e+e- collisions
at
183-209 GeV
The OPAL Collaboration (Received: 14 July 2003 / Published online: 9 January 2004)
Abstract
In total 1317 di-lepton events with significant missing transverse momentum were
identified in a total data sample of 680 pb
-1 collected at
e+e-
centre-of-mass energies ranging from 183 GeV to 209 GeV. The number of di-lepton
events, the dependence on centre-of-mass energy, and the event properties are
consistent with expectations from Standard Model processes, predominantly
W+W- production with both W bosons decaying leptonically. This topology is
also an experimental signature for the pair production of new particles that
decay to a charged lepton accompanied by one or more invisible particles. No
evidence for new phenomena is apparent. Upper limits are presented on the
production cross-section multiplied by the relevant branching ratio squared for
sleptons, leptonically decaying charginos and charged Higgs bosons. Mass limits
are also given.
© Società Italiana di Fisica, Springer-Verlag 2004
