Search for neutral and charged Higgs bosons in collisions at = 161 GeV and 172 GeV
DELPHI Collaboration, P. Abreu21 et al.
21LIP, IST, FCUL - Av. Elias Garcia, 14-1o, P-1000 Lisboa Codex, Portugal
Received: 18 August 1997
Abstract
A search for neutral and charged Higgs bosons has been performed in the data
collected by the DELPHI detector at centre-of-mass energies of 161 GeV
and 172 GeV.
The analysis assumes either the pair-production of charged Higgs bosons,
,or the production of the lightest neutral Higgs boson, h, with either a
Z or a neutral pseudoscalar Higgs boson, A.
All final state topologies expected from the decay of h and A
into hadrons or a pair of leptons, and from the decay of
into a pair of quarks or a pair have been considered.
Lower limits at the 95% confidence level have been obtained on the Higgs
boson masses. The limits are
66.2 GeV/c2 for h in the Standard Model, 59.5 GeV/c2 for h
and 51.0 GeV/c2 for A in the minimal supersymmetric extension
of the Standard Model with sensible assumptions on the model parameters
and, using the 161 GeV data only, 51.5 GeV/c2 for in the general two-doublet scheme for branching fractions into hadrons below 0.8.
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