Antenna showers with one-loop matrix elements

Hartgring, Lisa; Laenen, Eric

doi:10.1007/jhep10(2013)127

Cited by 67 publications

(107 citation statements)

References 104 publications

(325 reference statements)

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“…The biggest surprise is the significant change observed when using an alternative shower evolution variable ("alt Q E "), which persists at hadron level. Although this variation is theoretically disfavored (the default p ⊥ evolution variable has been shown to reproduce the logarithmic structure of the qq → qgq antenna function to second order in α s [116]), formal control of the ambiguity would depend on one-loop corrections. It would therefore be interesting to determine the extent to which multi-leg NLO merging techniques (such as UNLOPS [117]) would reduce it, and/or whether second-order corrections to the shower kernels are required (for which only a proof of concept currently exists [118]).…”

Section: Jhep07(2017)091mentioning

confidence: 99%

Systematics of quark/gluon tagging

Gras

Höche

Kar

et al. 2017

J. High Energ. Phys.

130

164

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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 protonproton 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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Section: Jhep07(2017)091mentioning

confidence: 99%

Systematics of quark/gluon tagging

Gras

Höche

Kar

et al. 2017

J. High Energ. Phys.

130

164

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“…e + e − collisions with the distributions predicted by the Vincia [85][86][87][88][89][90] Monte Carlo program at hadron level. Excellent agreement between analytic and Monte Carlo predictions is observed, demonstrating a quantitative understanding of boosted jet observables from first principles.…”

Section: Jhep05(2016)117mentioning

confidence: 99%

Analytic boosted boson discrimination

Larkoski

Moult

Neill

2016

J. High Energ. Phys.

109

166

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Observables which discriminate boosted topologies from massive QCD jets are of great importance for the success of the jet substructure program at the Large Hadron Collider. Such observables, while both widely and successfully used, have been studied almost exclusively with Monte Carlo simulations. In this paper we present the first all-orders factorization theorem for a two-prong discriminant based on a jet shape variable, D 2 , valid for both signal and background jets. Our factorization theorem simultaneously describes the production of both collinear and soft subjets, and we introduce a novel zero-bin procedure to correctly describe the transition region between these limits. By proving an all orders factorization theorem, we enable a systematically improvable description, and allow for precision comparisons between data, Monte Carlo, and first principles QCD calculations for jet substructure observables. Using our factorization theorem, we present numerical results for the discrimination of a boosted Z boson from massive QCD background jets. We compare our results with Monte Carlo predictions which allows for a detailed understanding of the extent to which these generators accurately describe the formation of two-prong QCD jets, and informs their usage in substructure analyses. Our calculation also provides considerable insight into the discrimination power and calculability of jet substructure observables in general.

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“…The shower model takes colour coherence into account through the antenna function formalism. This option is the preferred choice for the VINCIA shower [11].…”

Section: Parton Shower Modelsmentioning

confidence: 99%

Measurement of parton shower observables with OPAL

Fischer

Gieseke

Kluth

et al. 2016

EPJ Web of Conferences

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Abstract. A study of QCD coherence is presented based on a sample of about 397,000 e+e-hadronic annihilation events collected at √ s = 91 GeV with the OPAL detector at LEP. The study is based on four recently proposed observables that are sensitive to coherence effects in the perturbative regime. The measurement of these observables is presented, along with a comparison with the predictions of different parton shower models. The models include both conventional parton shower models and dipole antenna models. Different ordering variables are used to investigate their influence on the predictions.

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Antenna showers with one-loop matrix elements

Cited by 67 publications

References 104 publications

Systematics of quark/gluon tagging

Systematics of quark/gluon tagging

Analytic boosted boson discrimination

Measurement of parton shower observables with OPAL

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