Systematics of quark/gluon tagging

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Date

2017-07

Authors

Gras, P.
Höche, S.
Kar, D.
Larkoski, A.
Lönnblad, L.
Plätzer, S.
Siódmok, A.
Skands, P.
Soyez, G.
Thaler, J.

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Springer Verlag

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 (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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Keywords

Jets, QCD Phenomenology, EVENT SHAPE DISTRIBUTIONS, QCD ANALYTIC PREDICTIONS, GLUON JET PROPERTIES, QUARK JETS, HERWIG PLUS, POWER CORRECTIONS, 3-JET EVENTS, PARTON, DIPOLE, TESTS

Citation

Gras, P. et al. 2017. Systematics of quark/gluon tagging. JOURNAL OF HIGH ENERGY PHYSICS 2017(7), Article number 91.

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