Home > Research > Publications & Outputs > Light-quark and gluon jet discrimination in pp ...

Associated organisational unit

Electronic data

  • art%3A10.1140%2Fepjc%2Fs10052-014-3023-z

    Rights statement: EPJC is an open-access journal funded by SCOAP3 and licensed under CC BY 4.0

    Final published version, 1.36 MB, PDF document

    Available under license: CC BY

Links

Text available via DOI:

View graph of relations

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

Research output: Contribution to journalJournal articlepeer-review

Published
  • The ATLAS collaboration
Close
Article number3023
<mark>Journal publication date</mark>21/08/2014
<mark>Journal</mark>European Physical Journal C: Particles and Fields
Issue number8
Volume74
Number of pages29
Publication StatusPublished
<mark>Original language</mark>English

Abstract

A likelihood-based discriminant for the identification of quark- and gluon-initiated jets is built and validated using 4.7 fb −1 of proton–proton collision data at s√=7 TeV 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 ≈ 10–20 %. In data, light-quark jets can be tagged with an efficiency of ≈50% while achieving a gluon-jet mis-tag rate of ≈25% in a pT range between 40 GeV and 360 GeV 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.

Bibliographic note

EPJC is an open-access journal funded by SCOAP3 and licensed under CC BY 4.0