Search for Charged Higgs bosons: Preliminary Combined Results Using LEP data Collected at Energies up to 209 GeV

TL;DR

This paper reports combined results from LEP experiments searching for charged Higgs bosons, setting a lower mass limit of 78.6 GeV at 95% confidence level based on data collected up to 209 GeV.

Contribution

First combined analysis of LEP data providing new lower mass bounds for charged Higgs bosons in two-doublet models.

Findings

Charged Higgs bosons with mass below 78.6 GeV are excluded at 95% confidence.

Data from energies up to 209 GeV constrain Higgs boson properties.

Combined LEP data improves previous bounds on charged Higgs masses.

Abstract

In the year 2000 the four LEP experiments have collected 870 pb-1 of data at energies between 200 and 209 GeV, with about 510 pb-1 above 206 GeV. These data have been combined with data sets collected earlier at lower energies. %The following 95% confidence level bounds have been obtained. For charged Higgs bosons predicted by two-doublet extensions of the Standard Model and decaying only into the channels H+->csbar and tau+nutau, a lower mass bound of 78.6 GeV is obtained, at the 95% confidence level.