Search for Charged Higgs Bosons in $e^+e^-$ Collisions at $\sqrt{s} = 189-209$ GeV

A search is made for charged Higgs bosons predicted by Two-Higgs-Doublet extensions of the Standard Model (2HDM) using electron-positron collision data collected by the OPAL experiment at sqrt(s)=189-209 GeV, corresponding to an integrated luminosity of approximately 600 pb-1. Charged Higgs bosons are assumed to be pair-produced and to decay into q qbar, tau nu or A W+-. No signal is observed. Model-independent limits on the charged Higgs-boson production cross section are derived by combining these results with previous searches at lower energies. Under the assumption BR(H+- -> tau nu) + BR(H+- -> qq)=1, motivated by general 2HDM type II models, excluded areas on the [m(H+-), BR(H+- -> tau nu)] plane are presented and charged Higgs bosons are excluded up to a mass of 76.3 GeV at 95% confidence level, independent of the branching ratio BR(H+- -> tau nu). A scan of the 2HDM type I model parameter space is performed and limits on the Higgs-boson masses m(H+-) and m(A) are presented for different choices of tan(beta).

Note:

33 pages, 13 figures, 10 tables, Accepted by Eur. Phys. J. C

electron positron: annihilation
Higgs particle: charged particle: search for
Higgs particle: doublet: 2
Higgs particle: pair production
Higgs particle: decay modes
Higgs particle: mass: lower limit
minimal supersymmetric standard model
OPAL
experimental results
CERN LEP Stor

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Search for Charged Higgs Bosons in e+e−e^+e^-e+e− Collisions at s=189−209\sqrt{s} = 189-209s​=189−209 GeV

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Search for Charged Higgs Bosons in $e^+e^-$ Collisions at $\sqrt{s} = 189-209$ GeV