Searches for TeV-scale particles at the LHC using jet shapes

New particles at the TeV scale can decay hadronically with strongly collimated jets, thus the standard reconstruction methods based on invariant masses of well-separated jets can fail. We discuss how to identify such particles in $pp$ collisions at the LHC using simple jet shapes which help to reduce the contribution of QCD-induced events. We focus on a rather generic example X→tt̄→hadrons, with X being a heavy particle, but the approach is well suited for the reconstruction of other decay channels characterized by a cascade decay of known states.