3-10 August 2016
Chicago IL USA
US/Central timezone
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Boosted Higgs —> bb tagging in ATLAS

Aug 6, 2016, 6:00 PM
2h
Riverwalk A/B

Riverwalk A/B

Poster Higgs Physics Poster Session

Speaker

Nikola Lazar Whallon (University of Washington (US))

Description

High $p_{T}$ (``boosted'') Higgs bosons decaying into a pair of $b$-quarks are an important signature for many physics searches in Run 2. The reconstruction and identification of such signatures relies mainly on the long-lived nature of the $b$-hadrons arising from the fragmentation of the $b$-quarks. Several advanced Higgs boson tagging techniques are presented here, including the reconstruction of the $b$-hadrons as subjets, the reconstruction of the vertices from the $b$-hadron decays, and the combination of this information into a boosted decision tree (BDT). In addition, new subjet tagging techniques are investigated: the use of variable radius track jets and of exclusive $k_{T}$ calorimeter subjets, as well as a multiple secondary vertex (MSV) algorithm to reconstruct simultaneously the decay chain of both $b$-hadrons. The best performing Higgs boson tagger is found to be a BDT combination of the MSV algorithm and the subjet-based $b$-tagging algorithms.

Primary author

ATLAS Collaboration (CERN)

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