2020 Impact factor 4.590
Particles and Fields
Eur. Phys. J. C 2, 1-37

Search for neutral and charged Higgs bosons in $\bf {e^+e^- \;}$ collisions at $\bf\sqrt{s}$ = 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

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, ${\rm H}^{\pm}$,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 $\tau$ leptons, and from the decay of ${\rm H}^{\pm}$into a pair of quarks or a $\tau \nu_{\tau}$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 ${\rm H}^{\pm}$in the general two-doublet scheme for ${\rm H}^{\pm}$branching fractions into hadrons below 0.8.

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