The results of a search for an excited bottom-quark b in pp collisions at s=7 TeV, using 4.7 fb-1 of data collected by the ATLAS detector at the LHC are presented. In the model studied, a single b -quark is produced through a chromomagnetic interaction and subsequently decays to a W boson and a top quark. The search is performed in the dilepton and lepton+jets final states, which are combined...
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