DOI 10.1007/s100529901102
Search for Higgs bosons in
collisions at 183 GeV
The OPAL Collaboration
G.Abbiendi 2 et al.
2Dipartimento di Fisica dell' Università di Bologna and INFN, I-40126 Bologna, Italy
Received: 27 October 1998 / Published online: 19 February 1999
Abstract
The data collected by the OPAL experiment at GeV were used to
search for Higgs bosons which are predicted by
the Standard Model and various extensions, such as general models with
two Higgs field doublets and the Minimal Supersymmetric Standard Model (MSSM).
The data correspond to an integrated luminosity of approximately
54 pb-1.
None of the searches for neutral and charged Higgs bosons have revealed
an excess of events beyond the expected background. This negative outcome,
in combination with similar results from searches at lower energies, leads
to new limits for the Higgs boson masses and other model parameters.
In particular, the 95% confidence level lower limit for the mass of
the Standard Model Higgs boson is 88.3 GeV.
Charged Higgs bosons can be excluded for masses up to 59.5 GeV.
In the MSSM,
GeV and
GeV are
obtained for
, no and maximal scalar top mixing and
soft SUSY-breaking masses of 1 TeV.
The range
is excluded for minimal scalar
top mixing and
GeV.
More general scans of the MSSM parameter space are also considered.
Copyright Springer-Verlag