Search for charged Higgs bosons in e^+e- collisions at sqrt{s} = 130 - 172 GeV

TL;DR

This paper reports a search for charged Higgs bosons in electron-positron collisions at energies between 130 and 172 GeV, using OPAL detector data, but finds no evidence and sets a lower mass limit of 52 GeV.

Contribution

The study provides the first direct search for charged Higgs bosons at these energies and establishes a mass lower limit independent of decay branching ratios.

Findings

No evidence for charged Higgs boson production.

Mass lower limit set at 52 GeV at 95% confidence level.

Results constrain models predicting charged Higgs bosons.

Abstract

A search is described to detect charged Higgs bosons via the process e^+e^- -> H^+H^-, using data collected by the OPAL detector at center-of-mass energies of 130-172 GeV with a total integrated luminosity of 25 pb^-1. The decay channels are assumed to be H^+ -> qq'(bar) and H^+ -> \tau^+ \nu_{\tau}. No evidence for charged Higgs boson production is observed. The lower limit for its mass is determined to be 52 GeV at 95% confidence level, independent of the H^+ -> \tau^+ \nu_{\tau} branching ratio.