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Title: Systematics of quark/gluon tagging

By measuring the substructure of a jet, one can assign it a “quark” or “gluon” tag. In the eikonal (double-logarithmic) limit, quark/gluon discrimination is determined solely by the color factor of the initiating parton (C F versus C A). In this paper, we confront the challenges faced when going beyond this leading-order understanding, using both parton-shower generators and first-principles calculations to assess the impact of higher-order perturbative and nonperturbative physics. Working in the idealized context of electron-positron collisions, where one can define a proxy for quark and gluon jets based on the Lorentz structure of the production vertex, we find a fascinating interplay between perturbative shower effects and nonperturbative hadronization effects. Turning to proton-proton collisions, we highlight a core set of measurements that would constrain current uncertainties in quark/gluon tagging and improve the overall modeling of jets at the Large Hadron Collider.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8] ;  [9] ;  [10]
  1. Univ. of Paris-Saclay, Gif-sur-Yvette (France)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  3. Univ. of Witwatersrand, Johannesburg (South Africa)
  4. Reed College, Portland, OR (United States)
  5. Lund Univ. (Sweden)
  6. Univ. of Durham (United Kingdom); Univ. of Manchester (United Kingdom)
  7. European Organization for Nuclear Research (CERN), Geneva (Switzerland); Polish Academy of Sciences (PAS), Sopot (Poland). Inst. of Nuclear Physics
  8. Monash Univ., Clayton, VIC (Australia)
  9. Alternative Energies and Atomic Energy Commission (CEA), Saclay (France)
  10. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Publication Date:
Grant/Contract Number:
AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2017; Journal Issue: 7; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Jets; QCD Phenomenology
OSTI Identifier:
1374262