ATLAS collaboration (2894 authors)Aguilar-Saavedra, Juan AntonioAmor Dos Santos, Susana PatriciaAnjos, NunoCantrill, RobertCarvalho, JoãoCastro, Nuno FilipeConde Muiño, PatriciaDa Cunha Sargedas De Sousa, Mario JoseDo Valle Wemans, AndréFiolhais, MiguelGalhardo, BrunoGomes, AgostinhoGonçalo, RicardoJorge, PedroLopes, LourencoMachado Miguens, JoanaMaio, AméliaManeira, JoséOliveira, Miguel AlfonsoOnofre, AntónioPalma, AlbertoPina, João AntonioPinto, BelmiroSantos, HelenaSaraiva, JoãoSilva, JoséVeloso, FilipeWolters, Helmut2019-02-032019-02-032013-06-06http://dx.doi.org/10.1140/epjc/s10052-013-2465-zhttp://hdl.handle.net/10400.26/26388A search for a charged Higgs boson ($H^+$) in $t\bar{t}$ decays is presented, where one of the top quarks decays via $t \to H^+b$, followed by $H^+ \to$ two jets ($c\bar{s}$). The other top quark decays to Wb, where the W boson then decays into a lepton ($e/\mu$) and a neutrino. The data were recorded in pp collisions at $\sqrt{s}$ = 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 $B(H^+ \to c\bar{s})$=100%.engjournal article2019-02-03