Wuppertal 2015 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 20: Top: Boosted top, Resonanzen

T 20.2: Vortrag

Montag, 9. März 2015, 17:05–17:20, L.10.31 (HS 10)

Top tagging algorithms in CMS — Johannes Haller, Roman Kogler, and •Tobias Lapsien — University of Hamburg

Top quarks with high transverse momenta will be produced abundantly at the LHC with increasing center of mass energy. The identification of hadronically decaying top quarks (t → bW → b q q) imposes various challenges, since at high transverse momenta all decay products are collimated in one jet. Various algorithms to identify these top quarks, while rejecting light flavour jets, have been studied and employed in CMS. New developments in jet substructure techniques make it possible to improve these existing top taggers significantly. In this talk, various improvements of top tagging algorithms are shown and results are presented based on the shower deconstruction tagger and the MultiR HEP Top tagger. Also measurements of efficiency and misidentification rates of these new top tagging algorithms in the √s=8TeV dataset will be shown.