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This paper reports a detailed study of techniques for identifying boosted,hadronically decaying $W$ bosons using 20fb$^{-1}$ of proton-proton collisiondata collected by the ATLAS detector at the LHC at a centre-of-mass energy$\sqrt{s} =$ 8 TeV. A range of techniques for optimising the signal jet massresolution are combined with various jet substructure variables. The results ofthese studies in Monte Carlo simulations show that a simple pairwisecombination of groomed jet mass and one substructure variable can provide a 50%efficiency for identifying $W$ bosons with transverse momenta larger than 200GeV while maintaining multijet background efficiencies of 2-4% for jets withthe same transverse momentum. These signal and background efficiencies areconfirmed in data for a selection of tagging techniques.

Identification of boosted, hadronically decaying W bosons and comparisons with ATLAS data taken at $\sqrt{s} = 8$ TeV