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T: Fachverband Teilchenphysik
T 46: Top: Boosted b-tagging, single top
T 46.4: Talk
Tuesday, March 10, 2015, 17:30–17:45, L.09.31 (HS 11)
Boosted-Top Tagging within busy environments with HEPTopTagger — Elin Bergeaas Kuutmann1, Janet Dietrich2, •Geoffrey Herbert2, and Heiko Lacker2 — 1Uppsala Universitet — 2Humboldt Universität zu Berlin
Several new physics models predict the existence of high mass particles capable of being produced at the LHC. Many of these particles could have decay topologies involving top quarks. These top quarks can be produced with high momentum (dependent on parent particle mass) and can become “boosted”. Boosted-top tagging techniques are now well established within high energy particle physics, however their use up to now has primarily been within fairly clean decay environments (e.g. Z’ resonance searches relying on two top quarks being produced with a large angle of separation between them. New physics particles with busy production and decay topologies (multiple particles, small angular separation) are a relatively new challenge for boosted-top tagging techniques. In this talk a new method of object reconstruction based on HEPTopTagger is explored to optimise a search strategy in busy environments. An analysis strategy conducted in ATLAS is presented.