Light-quark and gluon jet discrimination in pp collisions at √s=7 TeV with the ATLAS detector

The ATLAS Collaboration

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

A likelihood-based discriminant for the identification of quark- and gluon-initiated jets is built and validated using 4.7 fb(Formula presented.) of proton–proton collision data at (Formula presented.) collected with the ATLAS detector at the LHC. Data samples with enriched quark or gluon content are used in the construction and validation of templates of jet properties that are the input to the likelihood-based discriminant. The discriminating power of the jet tagger is established in both data and Monte Carlo samples within a systematic uncertainty of (Formula presented.) 10–20 %. In data, light-quark jets can be tagged with an efficiency of (Formula presented.) while achieving a gluon-jet mis-tag rate of (Formula presented.) in a (Formula presented.) range between (Formula presented.) and (Formula presented.) for jets in the acceptance of the tracker. The rejection of gluon-jets found in the data is significantly below what is attainable using a Pythia 6 Monte Carlo simulation, where gluon-jet mis-tag rates of 10 % can be reached for a 50 % selection efficiency of light-quark jets using the same jet properties.

Original languageEnglish
Article number3023
Pages (from-to)1-29
Number of pages29
JournalEuropean Physical Journal C
Volume74
Issue number8
DOIs
Publication statusPublished - 2014 Aug 1
Externally publishedYes

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Physics and Astronomy (miscellaneous)

Fingerprint Dive into the research topics of 'Light-quark and gluon jet discrimination in pp collisions at √s=7 TeV with the ATLAS detector'. Together they form a unique fingerprint.

  • Cite this