Search for Charged Higgs bosons: Combined Results Using LEP Data

TL;DR

This paper reports a combined analysis of LEP data searching for charged Higgs bosons within Two Higgs Doublet Models, setting exclusion limits on their masses and parameter space.

Contribution

It provides the first combined LEP results for charged Higgs boson searches, improving constraints within 2HDMs for Type I and Type II scenarios.

Findings

No significant excess observed over Standard Model background.

Charged Higgs bosons with mass below 80 GeV/c^2 (Type II) are excluded.

Charged Higgs bosons with mass below 72.5 GeV/c^2 (Type I) are excluded.

Abstract

The four LEP collaborations, ALEPH, DELPHI, L3 and OPAL, have searched for pair-produced charged Higgs bosons in the framework of Two Higgs Doublet Models (2HDMs). The data of the four experiments are statistically combined. The results are interpreted within the 2HDM for Type I and Type II benchmark scenarios. No statistically significant excess has been observed when compared to the Standard Model background prediction, and the combined LEP data exclude large regions of the model parameter space. Charged Higgs bosons with mass below 80 GeV/c^2 (Type II scenario) or 72.5 GeV/c^2 (Type I scenario, for pseudo-scalar masses above 12 GeV/c^2) are excluded at the 95% confidence level.