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A method is proposed for distinguishing highly boosted hadronically decayingW's (W-jets) from QCD-jets using jet substructure. Previous methods, such asthe filtering/mass-drop method, can give a factor of ~2 improvement inS/sqrt(B) for jet pT > 200 GeV. In contrast, a multivariate approach includingnew discriminants such as R-cores, which characterize the shape of the W-jet,subjet planar flow, and grooming-sensitivities is shown to provide a muchlarger factor of ~5 improvement in S/sqrt(B). For longitudinally polarized W's,such as those coming from many new physics models, the discrimination is evenbetter. Comparing different Monte Carlo simulations, we observe a sensitivityof some variables to the underlying event; however, even with a conservativeestimates, the multivariate approach is very powerful. Applications tosemileptonic WW resonance searches and all-hadronic W+jet searches at the LHCare also discussed. Code implementing our W-jet tagging algorithm is publiclyavailable at http://jets.physics.harvard.edu/wtag

W-jet Tagging: Optimizing the Identification of Boosted Hadronically-Decaying W Bosons