Systematics of quark/gluon tagging - INSPIRE

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Systematics of quark/gluon tagging

Philippe Gras
(
- IRFU, Saclay
)
,
Stefan Höche
(
- SLAC
)
,
Deepak Kar
(
- Witwatersrand U.
)
,
Andrew Larkoski
(
- Reed Coll.
)
,
Leif Lönnblad
(
- Lund U. and
- Lund U., Dept. Theor. Phys.
)

Apr 12, 2017

51 pages

Published in:

JHEP 07 (2017) 091

Published: Jul 18, 2017

e-Print:

1704.03878 [hep-ph]

DOI:

10.1007/JHEP07(2017)091

Report number:

MIT-CTP-4885,
COEPP-MN-17-2,
MCNET-17-04

View in:

reference search158 citations

Citations per year

Abstract: (Springer)

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.

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

Jets
QCD Phenomenology
gluon: jet
quark: jet
hadronization: effect
higher-order: 0
p p: scattering
structure
electron positron: scattering
CERN LHC Coll

References(140)

Figures(48)

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(
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,
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(
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)
,
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)
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(
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)
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(
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)

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(
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)
,
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(
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)
,
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(
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)
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(
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)
,
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(
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)
,
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(
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)
,
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(
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)
,
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(
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)

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(
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)
,
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(
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)
,
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(
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)

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(
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)
,
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(
- CERN
)

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