Identifying Boosted Objects with N-subjettiness

Details Identifying Boosted Objects with N-subjettiness Identifying Boosted Objects with N-subjettiness

2010-11-10

arxiv.org/abs/1011.2268v3

JHEP 1103:015,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

26 pages, 26 figures, 2 tables; v2: references added; v3: discussion of results extended

Scientific paper

10.1007/JHEP03(2011)015

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.

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