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 have been 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 \({\rm GeV}/c^{2}\) (Type II scenario) or 72.5 \({\rm GeV}/c^{2}\) (Type I scenario, for pseudo-scalar masses above 12 \({\rm GeV}/c^{2}\)) are excluded at the 95 % confidence level.
Highlights
A charged Higgs boson appears in many extensions of the Higgs sector beyond the Standard Model (SM)
The first one effectively allows the charged Higgs boson to decay to fermions only, which is the case in type II 2HDM for not too small values of mA or tan β
No significant excess over the SM background is observed, and the exclusion limits are extended by several GeV/c2 with respect to the final results of the individual collaborations [4, 5, 7, 8] and the previous combination [3]
Summary
A charged Higgs boson appears in many extensions of the Higgs sector beyond the Standard Model (SM). The first one effectively allows the charged Higgs boson to decay to fermions only, which is the case in type II 2HDM for not too small values of mA (the neutral CP-odd A boson mass) or tan β (the ratio of the two Higgs doublet vacuum expectation values). The correlations between search channels, LEP collision energies and individual experiments have not been taken into account, but these correlations are estimated to have only small effects, about 500 MeV/c2, to the final results
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