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Advanced Jet Tagging Techniques for High-Energy Physics Experiments

Explore the advanced jet tagging and jet veto techniques used in high-energy physics experiments, focusing on methods for b-tagging, discrimination between b-quarks and light quarks or gluons, and the calibration of jets. Learn about the latest software changes and planned improvements in tagging efficiency and future enhancements. Stay informed about key performance requirements and updates in b-tagging technology for particle physics experiments at high energy levels.

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Advanced Jet Tagging Techniques for High-Energy Physics Experiments

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  1. NA-ATLAS mtg

  2. Experience from the Tevatron – Chlebana FNAL

  3. Experience from the Tevatron – Chlebana FNAL

  4. Experience from the Tevatron – Chlebana FNAL

  5. Experience from the Tevatron – Chlebana FNAL

  6. Rate of leading jet in Zee, + jets after central jet veto Jet Tagging and Jet Veto • Z ee, + jets gives a large statistics sample for the calibration of jets all the way to the forward region • Signalextraction does not depend directly on jet energy scale. Enough to have 5% (10%) energy scale uncertainty for central (forward) jets • Study central jet veto with same sample See W.Quayle’s talk Mellado – Performance requirements

  7. Huston

  8. Huston

  9. Huston

  10. Seuster Jet/Et-miss

  11. Narain – b-tagging Technique • Quite a few Taggers are available: • Impact Parameter based taggers (IP2D, IP3D) • Secondary vertex reconstruction based • Provide discrimination based on a comparison between two hypotheses: • likelihood for a jet to originate from a b-quark(b) OR a light-quark/gluon (u) • For each discriminating variable x in a tagger, build calibration functions for the two hypotheses • Pb(x) and Pu(x) • The final discriminating variable (jet level) : W = x ln(Pb(x) /Pu(x)) Large W ~ high probability that the jet originates from a b quark

  12. J.-B. de Vivie, V.Kostyukhin A. Rozanov, L Vacavant Performance ( ) SV1+IP3D IP3D IP2D Lifetime2D lhSig • H events • Model u-jets using ttjj • release 10.0.1 • High eff crucial: εb4 as a function of pTand || @ 60%efficiency

  13. Planned Improvements • goal to reach εb=70 % with Ru=100 • A few planned improvements: (Some are already in 11.X.0 or will be in release 12) • combine space and soft leptons in jets • K0 and Λ0 impact parameters, no direct tracks IP • New tracking • track quality classification • multiple secondary vertices • shared/ambiguous hits, kill interactions • +…

  14. L Vacavant Software Changes • Transition from JetTag (‘previous’) and ParticleJet (‘new’) • A single collection for jets (calo+btagging information) • In the 11.X.0 branch • Implies that ‘previous’ AOD not readable w/ ‘new’ release. • For ‘previous’ btagging: • All releases 11.0.X are OK • Recommended: 11.0.4(,1,2) • For ‘new’ btagging: • 11.4.0 not recommended • 11.5.0: • Will be useable for b-tagging, including soft lepton taggers • 12.0.0: scheduled for 1st half of May… • possible to run ‘new’ btagging in 11.0.4(1,2)

  15. Beam xing angle ~ 1 GeV Half-angle 143mrad – vertical (CMS same angle, horizontal)

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