Abstract
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.
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ArXiv ePrint: 1704.03878
Coordinators for an initial version of this study appearing in ref. [1]. (Gregory Soyez, Jesse Thaler)
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Gras, P., Höche, S., Kar, D. et al. Systematics of quark/gluon tagging. J. High Energ. Phys. 2017, 91 (2017). https://doi.org/10.1007/JHEP07(2017)091
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DOI: https://doi.org/10.1007/JHEP07(2017)091