Search for a light charged Higgs boson in the decay channel H+ → c¯s in t¯t events using pp collisions at √s = 7 TeV with the ATLAS detector

Aad, G. and Abajyan, T. and Abbott, B. and Abdallah, J. and Khalek, S. A. and Abdelalim, A. A. and Abdinov, O. and Aben, R. and Abi, B. and Abolins, M. and AbouZeid, O. S. and Abramowicz, H. and Abreu, H. and Acharya, B. S. and Adamczyk, L. and Adams, D. L. and Addy, T. N. and Adelman, J. and Adomeit, S. and Adragna, P. and Adye, T. and Aefsky, S. and Aguilar-Saavedra, J. A. and Agustoni, M. and Ahlen, S. P. and Ahles, F. and Ahmad, A. and Ahsan, M. and Aielli, G. and Akesson, T. P. A. and Krasznahorkay, Attila and Pásztor, Gabriella and Tóth, József (2013) Search for a light charged Higgs boson in the decay channel H+ → c¯s in t¯t events using pp collisions at √s = 7 TeV with the ATLAS detector. EUROPEAN PHYSICAL JOURNAL C, 73 (6). ISSN 1434-6044

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Abstract

A search for a charged Higgs boson (H+) in t¯t decays is presented, where one of the top quarks decays via t → H+b, followed by H+ → two jets (c¯s). The other top quark decays to W b, where the W boson then decays into a lepton (e/μ) and a neutrino. The data were recorded in pp collisions at √s = 7 TeV by the ATLAS detector at the LHC in 2011, and correspond to an integrated luminosity of 4.7 fb−1. With no observation of a signal, 95% confidence level (CL) upper limits are set on the decay branching ratio of top quarks to charged Higgs bosons varying between 5% and 1% for H+ masses between 90 GeV and 150 GeV, assuming B(H+ → c¯s) = 100%.

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