Search for charged Higgs bosons decaying via H+ -> tau nu in top quark pair events using pp collision data at sqrt(s) = 7 TeV with the ATLAS detector

The ATLAS Collaboration;Aad, Georges;Jez, Pavel;Tanasijczuk, Andres Jorge;et.al.
(2012) Journal of High Energy Physics — Vol. 1206, p. 39 (2012)

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Abstract
The results of a search for charged Higgs bosons are presented. The analysis is based on 4.6/fb of proton-proton collision data at sqrt(s) = 7 TeV collected by the ATLAS experiment at the Large Hadron Collider, using top quark pair events with a tau lepton in the final state. The data are consistent with the expected background from Standard Model processes. Assuming that the branching ratio of the charged Higgs boson to a tau lepton and a neutrino is 100%, this leads to upper limits on the branching ratio of top quark decays to a b quark and a charged Higgs boson between 5% and 1% for charged Higgs boson masses ranging from 90 GeV to 160 GeV, respectively. In the context of the mh-max scenario of the MSSM, tan(beta) above 12-26, as well as between 1 and 2-6, can be excluded for charged Higgs boson masses between 90 GeV and 150 GeV.
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The ATLAS Collaboration, Aad, G., Jez, P., Tanasijczuk, A. J., & et al. (2012). Search for charged Higgs bosons decaying via H+ -> tau nu in top quark pair events using pp collision data at sqrt(s) = 7 TeV with the ATLAS detector. Journal of High Energy Physics, 1206, 39. https://doi.org/10.1007/JHEP06(2012)039 (Original work published 2012)