Clark, Brian LeeFranklin, MelissaHuth, JohnIppolito, ValerioLazovich, TomoLopez Mateos, DavidMercurio, KevinMorii, MasahiroSpearman, WilliamSun, SiyuanTolley, EmmaTuna, AlexanderYen, AndyZambito, Stefano2017-06-072016Aad, G., B. Abbott, J. Abdallah, O. Abdinov, R. Aben, M. Abolins, et al. 2016. “Identification of boosted, hadronically decaying W bosons and comparisons with ATLAS data taken at s√=8 TeV.” The European Physical Journal C 76 (3) (March). doi:10.1140/epjc/s10052-016-3978-z.1434-6044http://nrs.harvard.edu/urn-3:HUL.InstRepos:32872604This paper reports a detailed study of techniques for identifying boosted, hadronically decaying W bosons using 20fb−1 of proton-proton collision data collected by the ATLAS detector at the LHC at a centre-of-mass energy s√= 8 TeV. A range of techniques for optimising the signal jet mass resolution are combined with various jet substructure variables. The results of these studies in Monte Carlo simulations show that a simple pairwise combination of groomed jet mass and one substructure variable can provide a 50% efficiency for identifying W bosons with transverse momenta larger than 200 GeV while maintaining multijet background efficiencies of 2-4% for jets with the same transverse momentum. These signal and background efficiencies are confirmed in data for a selection of tagging techniques.en-USJournal Article2017-06-0710.1140/epjc/s10052-016-3978-z