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Systematics of quark/gluon tagging
- Source :
- JHEP 1707 (2017) 091
- Publication Year :
- 2017
-
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.<br />Comment: 50 pages, 20 figures, extended version of the Les Houches 2015 study from arXiv:1605.04692; v2: updated to approximately match journal version, including improved discussion of nonperturbative Casimir scaling and more umlauts
- Subjects :
- High Energy Physics - Phenomenology
High Energy Physics - Experiment
Subjects
Details
- Database :
- arXiv
- Journal :
- JHEP 1707 (2017) 091
- Publication Type :
- Report
- Accession number :
- edsarx.1704.03878
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1007/JHEP07(2017)091