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The aim of this research program is to develop techniques to identify the flavor of hadronic jets, in particular: quark/gluon separation, tagging b-jets from gluon splitting, and the identification of highly boosted (bb) jets.
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Gluon bb tagging
The SLAC group have proposed, for the ?rst time in an hadron collider experiment, a technique to identify b-tagged jets from gluon splitting, and distinguish them from single b-tagged jets. This is important because the main backgrounds containing b?jets to signals from new physics, as well as for single-top, and Higgs production, consist of the production of a W boson in association with b?quarks produced by gluon splitting.
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We plan to use this neural network to select control samples with different gluon splitting content to test data/Monte Carlo agreement, reject b-tag background events, and improve the estimation of b-tag backgrounds.
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Highly boosted (bb)-jets
Very recently it has been proposed that (low mass) Higgs production in association with W boson could be efficiently identified at the LHC if the Higgs is produced with high transverse momentum. Highly boosted Higgs decaying to b-quarks produce a signature of merged (bb)-jets, which can be distinguished from generic QCD jets.
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