Machine learning-based b-jet tagging in $pp$ collisions at $\sqrt{s}=13$ TeV

Abstract

Studying heavy-flavor jets in $pp$ collision is important since they can test pQCD calculations and be used as a reference for heavy-ion collisions. Jets in this analysis are reconstructed from charged particles using the anti-$k_{\mathrm{T}}$ algorithm with a resolution parameter $R=$ 0.4 and with pseudorapidity $|\eta |<$ 0.5. Beauty jets are tagged using a machine learning model that uses a convolutional neural network trained on information extracted from the jet, tracks, and secondary vertices. The results show that this model is superior compared to other traditional tagging methods.

9 pages, 6 captioned figures

References in corpus (20)

• The anti-k_t jet clustering algorithm
• An Introduction to PYTHIA 8.2
• FastJet user manual
• Tuning PYTHIA 8.1: the Monash 2013 Tune
• Heavy quark colorimetry of QCD matter
• Identification of b-quark jets with the CMS experiment
• Extraction and validation of a new set of CMS PYTHIA8 tunes from underlying-event measurements
• Heavy Quark Energy Loss in Nuclear Medium
• Jet Flavour Classification Using DeepJet
• ATLAS flavour-tagging algorithms for the LHC Run 2 $pp$ collision dataset
• Evidence of b-jet quenching in PbPb collisions at sqrt(s[NN]) = 2.76 TeV
• Direct observation of the dead-cone effect in QCD
• Inclusive b-jet production in pp collisions at sqrt(s)=7 TeV
• Pseudorapidity distributions of charged particles as a function of mid and forward rapidity mutiplicities in pp collisions at $\sqrt{s}$ = 5.02, 7 and 13 TeV
• Measurement of the nuclear modification factor of $b$-jets in 5.02 TeV Pb+Pb collisions with the ATLAS detector
• Fast $b$-tagging at the high-level trigger of the ATLAS experiment in LHC Run 3
• Measurement of inclusive charged-particle b-jet production in pp and p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
• Measurement of b jet shapes in proton-proton collisions at $\sqrt{s}=$ 5.02 TeV
• Measurement of the production cross section for Z + b jets in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Search for medium effects using jets from bottom quarks in PbPb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV