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T: Fachverband Teilchenphysik

T 6: Higgs: H→bb, H→Leptonen

T 6.1: Vortrag

Montag, 9. März 2015, 14:00–14:15, M.10.12 (HS 14)

B-tagging in boosted h→ bb decays — •Ruth Jacobs, Götz Gaycken, Stephan Hageböck, Vadim Kostyukhin, Tatjana Lenz, Elisabeth Schopf, Eckhard von Törne, and Norbert Wermes — Physikalisches Institut, University of Bonn, Germany

The most likely decay channel of the standard model Higgs boson is the decay into a b- and an anti-b-quark. The properties of b-jets formed by the hadronization of b-quarks are essential input variables to all ATLAS h→  bb analyses. In boosted topologies the performance of standard b-tagging algorithms is diminished due to the merging of close - by jets. The aim of the study presented is the optimization of a b-tagging algorithm for boosted h→ bb decays using track jets with a smaller than standard cone radius. The study is based on simulated events containing boosted Higgs bosons from the decay of a new heavy gauge boson W^′→  Wh. A motivation for the use of track jets for b-tagging is the fact that the reconstructed jet axis for track jets more closely describes the b-hadron flight direction than for calorimeter jets. Using jets with a smaller cone radius allows to resolve topologies where larger radius jets are already merged.