Search for W' production in the single top channel with the ATLAS detector

We present the search for W' $\rightarrow$ tb using the LHC pp collision data collected with the ATLAS detector at a center-of- mass energy of 7 TeV. The largest backgrounds are the $t\bar{t}$ , W+jets, and multijets processes. To reduce their contribution we require an energetic final state including two jets, at least one must be tagged as a b-jet, one lepton, and missing energy. This measurement gives the latest limits on the W' $\rightarrow$ tb cross section times branching ratio as a function of the W' mass.