Abstract
We present a search for charged Higgs bosons in top quark decays. We analyze the e+jets, μ+jets, ee, eμ, μμ, τe and τμ final states from top quark pair production events, using data from about 1 fb−1 of integrated luminosity recorded by the DØ experiment at the Fermilab Tevatron Collider. We consider different scenarios of possible charged Higgs boson decays, one where the charged Higgs boson decays purely hadronically into a charm and a strange quark, another where it decays into a τ lepton and a τ neutrino and a third one where both decays appear. We extract limits on the branching ratio B(t→H+b) for all these models. We use two methods, one where the tt¯ production cross section is fixed, and one where the cross section is fitted simultaneously with B(t→H+b). Based on the extracted limits, we exclude regions in the charged Higgs boson mass and tanβ parameter space for different scenarios of the minimal supersymmetric standard model.
Highlights
In many extensions of the standard model (SM), including supersymmetry (SUSY) and grand unified theories, the existence of an additional Higgs doublet is required
Since we find no evidence for a charged Higgs boson, we extract upper limits on B(t → H+b), assuming that B(H+ → cs) = 1, or B(H+ → τ +ν) = 1, or a mixture of both
DØ reported limits on B(t → H+b) for the tauonic and leptophobic models extracted from cross section ratios [2] and for the tauonic model based on a measurement of the ttcross section in the + jets channel using topological event information [17]
Summary
In many extensions of the standard model (SM), including supersymmetry (SUSY) and grand unified theories, the existence of an additional Higgs doublet is required. Such models predict multiple physical Higgs particles, including three neutral and two charged Higgs bosons (H±) [1]. For small tan β, hadronic charged Higgs decays can become large in both the two-Higgs-doublet (2HDM) [4] and the minimal supersymmetric standard model (MSSM). The tauonic decays of the charged Higgs boson dominate at high tan β, for example, in the mhmax benchmark scenario [7] where B(H+ → τ +ν) can be close to one
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