The results of a search for charged Higgs bosons are presented. The analysis is based on 4.6 fb(-1) of proton-proton collision data at root s = 7TeV 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 90GeV to 160GeV, respectively. In the context of the m(h)(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 90GeV and 150GeV. RI Takai, Helio/C-3301-2012; Fabbri, Laura/H-3442-2012; Villa, Mauro/C-9883-2009; Jones, Roger/H-5578-2011; Wemans, Andre/A-6738-2012; Fazio, Salvatore /G-5156-2010; valente, paolo/A-6640-2010; Delmastro, Marco/I-5599-2012; Livan, Michele/D-7531-2012

Search for charged Higgs bosons decaying via H-+/- -> tau nu in t(t)over-bar events using pp collision data at root s=7 TeV with the ATLAS detector

CAPUA, Marcella;CROSETTI, Giovanni;Fazio S;LA ROTONDA, Laura;MASTROBERARDINO, Anna;Meoni E;