Abstract: 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 vs = 8, TeV. The charged Higgs boson is searched for in top quark decays for mH± < mt - mb, and in the direct production pp ? t(b)H± for mH± > mt - mb. The H± ? t±?t and H± ? tb decay modes in the final states th+jets, µth, l+jets, and ll’ (l =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 model-independent upper limit on the product branching fraction B(t?H±b)B(H±?t±?t)=1.2-0.15% is obtained in the mass range mH± = 80–160 GeV, while the upper limit on the cross section times branching fraction s(pp?t(b)H±)B(H±? t±?t)=0.38-0.025 pb is set in the mass range mH+ = 180–600 GeV. Here, s(pp ? t(b)H±) stands for the cross section sum s(pp?t¯(b)H+)+s(pp?t(b¯)H-). Assuming B(H±?tb)=1B(H±?tb)=1 , an upper limit on s(pp ? t(b)H±) of 2.0–0.13 pb is set for mH± = 180–600 GeV. The combination of all considered decay modes and final states is used to set exclusion limits in the mH±-tan ß parameter space in different MSSM benchmark scenarios.

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