2010/11/30 by Jesse Thaler, Ken Van Tilburg · 1 citation
Physics and Astronomy · #hep-ph #hep-ex
paper · pdf · doi:10.1007/jhep03(2011)015
published as JHEP 1103:015,2011 · 26 pages, 26 figures, 2 tables; v2: references added; v3: discussion of results extended
arxiv created 2011/01/25 · arxiv updated 2015/03/17
We introduce a new jet shape -- N-subjettiness -- designed to identify boosted hadronically-decaying objects like electroweak bosons and top quarks. Combined with a jet invariant mass cut, N-subjettiness is an effective discriminating variable for tagging boosted objects and rejecting the background of QCD jets with large invariant mass. In efficiency studies of boosted W bosons and top quarks, we find tagging efficiencies of 30% are achievable with fake rates of 1%. We also consider the discovery potential for new heavy resonances that decay to pairs of boosted objects, and find significant improvements are possible using N-subjettiness. In this way, N-subjettiness combines the advantages of jet shapes with the discriminating power seen in previous jet substructure algorithms.