PT Journal AU Altheimer, Aea Fassi, F Gonzalez de la Hoz, S Kaci, M Oliver Garcia, E Rodrigo, G Salt, J Sanchez Martinez, V Villaplana, M Vos, M TI Boosted objects and jet substructure at the LHC SO European Physical Journal C JI Eur. Phys. J. C PY 2014 BP 2792 - 24pp VL 74 IS 3 DI 10.1140/epjc/s10052-014-2792-8 LA English AB This report of the BOOST2012 workshop presents the results of four working groups that studied key aspects of jet substructure. We discuss the potential of first-principle QCD calculations to yield a precise description of the substructure of jets and study the accuracy of state-of-the-art Monte Carlo tools. Limitations of the experiments' ability to resolve substructure are evaluated, with a focus on the impact of additional (pile-up) proton proton collisions on jet substructure performance in future LHC operating scenarios. A final section summarizes the lessons learnt from jet substructure analyses in searches for new physics in the production of boosted top quarks. ER