Quark and gluon jet substructure

A bstract Distinguishing quark-initiated jets from gluon-initiated jets has the potential to significantly improve the reach of many beyond-the-standard model searches at the Large Hadron Collider and to provide additional tests of QCD. To explore whether quark and gluon jets could possibly be disti...

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Bibliographic Details
Published in:The journal of high energy physics 2013-04, Vol.2013 (4), p.1-40, Article 90
Main Authors: Gallicchio, Jason, Schwartz, Matthew D.
Format: Article
Language:English
Subjects:
Charging
Classical and Quantum Gravitation
Computer simulation
Elementary Particles
Gluons
High energy physics
Interactive
Large Hadron Collider
Mathematical models
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Quantum Physics
Quarks
Relativity Theory
String Theory
Substructures
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Summary:A bstract Distinguishing quark-initiated jets from gluon-initiated jets has the potential to significantly improve the reach of many beyond-the-standard model searches at the Large Hadron Collider and to provide additional tests of QCD. To explore whether quark and gluon jets could possibly be distinguished on an event-by-event basis, we perform a comprehensive simulation-based study. We explore a variety of motivated and unmotivated variables with a semi-automated multivariate approach. General conclusions are that at 50% quark jet acceptance efficiency, around 80%-90% of gluon jets can be rejected. Some benefit is gained by combining variables. Different event generators are compared, as are the effects of using only charged tracks to avoid pileup. Additional information, including interactive distributions of most variables and their cut efficiencies, can be found at http://jets.physics.harvard.edu/qvg .
ISSN:1029-8479
1029-8479
DOI:10.1007/JHEP04(2013)090