Abstract
A search for a charged Higgs boson is performed with a data sample corresponding to an integrated luminosity of 19.7 +/- 0.5 inverse femtobarns collected with the CMS detector in proton-proton collisions at sqrt(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+/- -> tau+/- nu[tau] and H+/- -> t b decay modes in the final states tau[h]+jets, mu tau[h], l+jets, and ll' (l = e, mu) 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+/- -> tau+/- nu[tau] )= 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 sigma( pp -> t (b) H+/- ) B( H+/- -> tau+/- nu[tau] ) = 0.38-0.025 pb is set in the mass range m(H+/-) = 180-600 GeV. Here, cross section sigma( pp -> t (b) H+/- ) stands for the sum sigma( pp -> t-bar (b) H+ ) + sigma( pp -> t (b-bar) H- ). Assuming B( H+/- -> t b ) = 1, an upper limit on sigma ( 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(beta) parameter space in different MSSM benchmark scenarios.
Highlights
In 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 couplings of the charged Higgs boson to up-type quarks is proportional to cot β while the charged Higgs boson couplings to the down-type quarks and charged leptons are proportional to tan β, where tan β is defined as the ratio of the vacuum expectation values of the two Higgs boson doublet fields
The backgrounds from the first two categories are estimated using simulation, except for the background due to Z/γ∗ → τ τ events with one τh and one τ decaying into a muon, which is estimated by taking for each variable the normalization from simulation and the shape from Z → μμ events in data, where each muon has been replaced with reconstructed particles from a simulated τ lepton decay
Summary
In 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. All the decay modes and final states considered are used to set exclusion limits in the mH+–tan β parameter space for different MSSM benchmark scenarios [29, 33]. To set these limits, the specific branching fractions predicted by those benchmark scenarios are applied.
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