Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/102310
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Type: Journal article
Title: Light-quark and gluon jet discrimination in pp collisions at √s=7 TeV with the ATLAS detector
Other Titles: Light-quark and gluon jet discrimination in pp collisions at root s=7 TeV with the ATLAS detector
Author: Aad, G.
ATLAS Collaboration
Citation: European Physical Journal C, 2014; 74(8):3023-1-3023-29
Publisher: Springer
Issue Date: 2014
ISSN: 1434-6044
1434-6052
Statement of
Responsibility: 
G. Aad … P. Jackson … L. Lee … a. Petridis … N. Soni … M. White .. The ATLAS Collaboration
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.
Keywords: ATLAS Collaboration; ATLAS Collaboration; ATLAS Collaboration
Rights: © CERN for the benefit of the ATLAS collaboration 2014. This article is published with open access at Springerlink.com
RMID: 0030013017
DOI: 10.1140/epjc/s10052-014-3023-z
Appears in Collections:Chemistry and Physics publications

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