The European Physical Journal C

ISSN: 1434-6044 (printed version)
ISSN: 1434-6052 (electronic version)

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Abstract Volume 2 Issue 1 (1998) pp 1-37

experimental physics:
Search for neutral and charged Higgs bosons in ${\rm e^+e^- \;}$ collisions at $\sqrt{s}$ = 161 GeV and 172 GeV

DELPHI Collaboration , P. Abreu et al. (21)

(21) LIP, IST, FCUL - Av. Elias Garcia, 14-1°, 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, ${\rm H}^{\pm}$, 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/$c^2$ for h in the Standard Model, 59.5 GeV/$c^2$ for h and 51.0 GeV/$c^2$ 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/$c^2$ 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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Online publication: March 3, 1998
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