Infrared safety of a neural-net top tagging algorithm

Suyong Choi, Seung J. Lee, Maxim Perelstein

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


Neural network-based algorithms provide a promising approach to jet classification problems, such as boosted top jet tagging. To date, NN-based top taggers demonstrated excellent performance in Monte Carlo studies. In this paper, we construct a top-jet tagger based on a Convolutional Neural Network (CNN), and apply it to parton-level boosted top samples, with and without an additional gluon in the final state. We show that the jet observable defined by the CNN obeys the canonical definition of infrared safety: it is unaffected by the presence of the extra gluon, as long as it is soft or collinear with one of the quarks. Our results indicate that the CNN tagger is robust with respect to possible mis-modeling of soft and collinear final-state radiation by Monte Carlo generators.

Original languageEnglish
Article number132
JournalJournal of High Energy Physics
Issue number2
Publication statusPublished - 2019 Feb 1

Bibliographical note

Publisher Copyright:
© 2019, The Author(s).


  • Jets
  • QCD Phenomenology

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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