We study the problem of distinguishing b-jets stemming from the decay of a colour singlet, such as the Higgs boson, from those originating from the abundant QCD background. In particular, as a case study, we focus on associate production of a vector boson and a Higgs boson decaying into a pair of b-jets, which has been recently observed at the LHC. We consider the combination of several theory-driven observables proposed in the literature, together with Lund jet plane images, in order to design an original Hbb tagger. The observables are combined by means of standard machine learning algorithms, which are trained on events obtained with fast detector simulation techniques. We find that the combination of high-level single-variable observables with the Lund jet plane provides an excellent discrimination performance. We also study the dependence of the tagger on the invariant mass of the decaying particles, in order to assess the extension to a generic Xbb tagger.

Cavallini, L., Coccaro, A., Khosa, C., Manco, G., Marzani, S., Parodi, F., et al. (2022). Tagging the Higgs boson decay to bottom quarks with colour-sensitive observables and the Lund jet plane. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 82(5) [10.1140/epjc/s10052-022-10447-1].

Tagging the Higgs boson decay to bottom quarks with colour-sensitive observables and the Lund jet plane

Stagnitto, G
2022

Abstract

We study the problem of distinguishing b-jets stemming from the decay of a colour singlet, such as the Higgs boson, from those originating from the abundant QCD background. In particular, as a case study, we focus on associate production of a vector boson and a Higgs boson decaying into a pair of b-jets, which has been recently observed at the LHC. We consider the combination of several theory-driven observables proposed in the literature, together with Lund jet plane images, in order to design an original Hbb tagger. The observables are combined by means of standard machine learning algorithms, which are trained on events obtained with fast detector simulation techniques. We find that the combination of high-level single-variable observables with the Lund jet plane provides an excellent discrimination performance. We also study the dependence of the tagger on the invariant mass of the decaying particles, in order to assess the extension to a generic Xbb tagger.
Articolo in rivista - Articolo scientifico
Jet substructure, Higgs boson
English
28-mag-2022
2022
82
5
493
open
Cavallini, L., Coccaro, A., Khosa, C., Manco, G., Marzani, S., Parodi, F., et al. (2022). Tagging the Higgs boson decay to bottom quarks with colour-sensitive observables and the Lund jet plane. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 82(5) [10.1140/epjc/s10052-022-10447-1].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/473139
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