Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 7, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP07(2017)091
Keywords
Jets; QCD Phenomenology
Categories
Funding
- U.S. Department of Energy (DOE) [DE-ACO2765F00515]
- Science Faculty Research Council, University of Witwatersrand
- MCnetITN FP7 Marie Curie Initial Training Network [PITN-GA-2012-315877]
- Swedish Research Council [621-2012-2283, 621-2013-4287]
- FP7 Marie Curie Intra European Fellowship [PIEF-GA-2013-628739]
- COST Action THOR [CA15213]
- National Science Centre, Poland [2016/23/D/ST2/02605]
- Australian Research Council Future Fellowship [FT130100744]
- Paris-Saclay IDEX under the IDEOPTIMALJE
- French Agence Nationale de la Recherche [ANR-15-CE31-0016]
- ERC Advanced Grant Higgs LHC [321133]
- DOE [DE-SC-00012567, DE-SC-00015476]
- European Research Council (ERC) [321133] Funding Source: European Research Council (ERC)
- Australian Research Council [FT130100744] Funding Source: Australian Research Council
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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 (CF versus CA). 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.
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