Search for $W'\rightarrow t\bar{b}$ in the lepton plus jets final states with the ATLAS detector at the LHC.

Many theoretical approaches beyond the Standard Model involve enhanced symmetries that introduce new charged vector current carried by new heavy gauge boson, usually called W′. This poster presents a specific search of the W′ boson, decaying to a top and a b quark in an effective coupling approach, by using a multivariate method based on boosted decision trees. It reports exclusion limits on the W′ → tb cross section times branching ratio as a function of the W’ boson mass and on the W ′ effective couplings. The search covers W’ boson masses between 0.5 and 3.0 TeV, for right-handed or left-handed W’ chiralities, with 20.3 fb−1 of proton-proton collisions data produced by the LHC in 2012, at a center-of-mass of 8 TeV, and collected by the ATLAS detector.