| Published Articles | |
| Report number | arXiv:1704.03878 ; MIT-CTP-4885 ; COEPP-MN-17-2 ; MCNET-17-04 |
| Title | Systematics of quark/gluon tagging |
| Author(s) | Gras, Philippe (IRFU, Saclay) ; Höche, Stefan (SLAC) ; Kar, Deepak (Witwatersrand U.) ; Larkoski, Andrew (Reed Coll.) ; Lönnblad, Leif (Lund U. ; Lund U., Dept. Theor. Phys.) ; Plätzer, Simon (Durham U. ; Durham U., IPPP ; Manchester U.) ; Siódmok, Andrzej (CERN ; Cracow, INP) ; Skands, Peter (Monash U.) ; Soyez, Gregory (IPhT, Saclay) ; Thaler, Jesse (MIT, Cambridge, CTP) |
| Publication | 2017-07-18 |
| Imprint | 2017-04-12 |
| Number of pages | 51 |
| Note | 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 |
| In: | JHEP 07 (2017) 091 |
| DOI | 10.1007/JHEP07(2017)091 |
| Subject category | hep-ex ; Particle Physics - Experiment ; hep-ph ; Particle Physics - Phenomenology |
| 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. |
| Copyright/License | arXiv nonexclusive-distrib. 1.0 |
Corresponding record in: Inspire
Rekord stworzony 2017-05-04, ostatnia modyfikacja 2023-08-24