A search for a charged Higgs boson is performed with a data sample corresponding to an integrated luminosity of 19.7 ± 0.5 fb −1 collected with the CMS detector in proton-proton collisions at √ s = 8,TeV. The charged Higgs boson is searched for in top quark decays for m H ± < m t − m b , and in the direct production pp → t(b)H ± for m H ± > m t − m b . The H ± → τ ± ν τ and H ± → tb decay modes in the final states τ h +jets, µτ h , +jets, and ' ( =e, µ) are considered in the search. No signal is observed and 95% confidence level upper limits are set on the charged Higgs boson production. A modelindependent upper limit on the product branching fraction B(t → H ± b) B(H ± → τ ± ν τ ) = 1.2-0.15% is obtained in the mass range m H ± = 80-160 GeV, while the upper limit on the cross section times branching fraction σ(pp → t(b)H ± ) B(H ± → τ ± ν τ ) = 0.38-0.025 pb is set in the mass range m H + = 180-600 GeV. Here, σ(pp → t(b)H ± ) stands for the cross section sum σ(pp → t(b)H + ) + σ(pp → t(b)H − ). Assuming B(H ± → tb) = 1, an upper limit on σ(pp → t(b)H ± ) of 2.0-0.13 pb is set for m H ± = 180-600 GeV. The combination of all considered decay modes and final states is used to set exclusion limits in the m H ± -tan β parameter space in different MSSM benchmark scenarios.Keywords: Hadron-Hadron Scattering, Higgs physics, Supersymmetry 9 Systematic uncertainties 20 9.1 Uncertainties common to the analyses 22 9.2 The τ h +jets final state for H + → τ + ν τ 23 9.3 The µτ h final state for H + → τ + ν τ and H + → tb 24 9.4 Dilepton (ee/eµ/µµ) final states for H + → τ + ν τ and H + → tb 26 9.5 Single-lepton (e/µ+jets) final states for H + → tb 27-i -
JHEP11(2015)01810 Results 28 10.1 Model-independent limits on charged Higgs boson production (H + → τ + ν τ ) 29 10.2 Limits on charged Higgs boson production with branching fraction assumed 29 10.3 Combined limits on tan β in MSSM benchmark scenarios 31
Summary 34The CMS collaboration 44
IntroductionIn 2012, a neutral boson with a mass of approximately 125 GeV was discovered by the CMS and ATLAS experiments [1][2][3] at the CERN LHC. The properties of the new boson are consistent with those predicted for the standard model (SM) Higgs boson [4][5][6][7][8][9]. Models with an extended Higgs sector are constrained by the measured mass, CP quantum numbers, and production rates of the new boson. The discovery of another scalar boson, neutral or charged, would represent unambiguous evidence for the presence of physics beyond the SM. Charged Higgs bosons are predicted in models including at least two Higgs doublets. The simplest of such models are the two-Higgs-doublet models (2HDM) [10]. Two Higgs doublets result in five physical Higgs bosons: light and heavy CP-even Higgs bosons h and H, a CP-odd Higgs boson A, plus two charged Higgs bosons H ± . Throughout this paper, charge conjugate states are implied, the cross section σ(pp → t(b)H + ) denotes the sum σ(pp → t(b)H + ) + σ(pp → t(b)H − ), and the branching fractions B(H + → X) stand for B(H ± → X). The minimal super...