<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi></mml:math>-parameter distribution at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">N</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msup><mml:msup><mml:mrow><mml:mi>LL</mml:mi></mml:mrow><mml:mrow><mml:mo>′</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>including power corrections

Hoang, André H.; Kolodrubetz, Daniel W.; Mateu, Vicent; Stewart, Iain W.

doi:10.1103/physrevd.91.094017

Cited by 116 publications

(141 citation statements)

References 84 publications

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“…-56 - shape using LEP data, and including power corrections and hadron mass effects [91,92], gives a value of Ω D = 0.28 GeV [160,161]. This agrees well with our values extracted through comparison with Monte Carlo.…”

Section: Jhep05(2016)117supporting

confidence: 80%

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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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Section: Jhep05(2016)117supporting

confidence: 80%

“…We refer the reader to, for example, refs. [83,84,[156][157][158][159][160][161] and references therein.…”

Section: Jhep05(2016)117mentioning

confidence: 99%

Analytic boosted boson discrimination

Larkoski

Moult

Neill

2016

J. High Energ. Phys.

109

166

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“…When this work was being finalised ref. [62] appeared, where an analytic resummation for the C parameter is presented. We compared their formulae to our analytic result for the C parameter, and found full agreement at NNLL.…”

Section: Discussionmentioning

confidence: 99%

A general method for the resummation of event-shape distributions in e + e − annihilation

Banfi

McAslan

Monni

et al. 2015

J. High Energ. Phys.

109

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“…We developed a natural generalization of those used for massless event shapes in Ref. [32], to which they reduce in the massless limit [19].…”

mentioning

confidence: 99%

Top Quark Mass Calibration for Monte Carlo Event Generators

et al. 2016

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The most precise top quark mass measurements use kinematic reconstruction methods, determining the top mass parameter of a Monte Carlo event generator m MC t . Because of hadronization and parton-shower dynamics, relating m MC t to a field theory mass is difficult. We present a calibration procedure to determine this relation using hadron level QCD predictions for observables with kinematic mass sensitivity. The highest precision measurements are based on direct reconstruction methods exploiting kinematic properties related to the top quark mass, and are based on multivariate fits that depend on a maximum amount of information on the top decay final states. This includes template and matrix element fits for distributions such as the measured invariant mass. These observables are highly differential, depending on experimental cuts and jet dynamics. Multipurpose Monte Carlo (MC) event generators are employed to do the analysis, and the results are influenced by both perturbative and nonperturbative QCD effects. Thus, the measured mass is the top mass parameter m MC t contained in the particular MC event generator. Its interpretation may also depend in part on the MC tuning and the observables used in the analysis.The systematic uncertainties from MC modeling are a dominant uncertainty in the above measurements, but do not address how m MC t is related to a mass parameter defined precisely in quantum field theory that can be globally used for higher-order predictions. The relation is nontrivial because it requires an understanding of the interplay between the partonic components of the MC generator (hard matrix elements and parton shower) and the hadronization model. In the context of top quark mass determinations, it is often assumed that MC generators should be considered as models whose partonic components and hadronization models are, through the tuning procedure, capable of describing experimental data to a precision that is higher than that of their partonic input.In the past m MC t has been frequently identified with the pole mass. This is compatible with parton-shower implementations for massive quarks, but a direct identification is disfavored because of sensitivity to nonperturbative effects from below the MC shower cutoff, Λ c ∼ 1 GeV. Also, the pole mass has an OðΛ QCD Þ renormalon ambiguity, while m MC t does not (since partonic information is not employed below Λ c ). It has been argued [4,5] can be calibrated into a field theory mass scheme through a fit of MC predictions to hadron level QCD computations for observables closely related to the distributions that enter the experimental analyses. In this Letter we provide a precise quantitative study on the interpretation of m MC t in terms of the MSR and pole mass schemes based on a hadron level prediction for the variable τ 2 for the production of a boosted top-antitop quark pair in e þ e − annihilation. It is defined aswhere the sum is over the 3-momenta of all final state particles, the maximum defines the thrust axisñ t , and Q is the center-of-ma...

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C-parameter distribution atN3LL′including power corrections

Cited by 116 publications

References 84 publications

Analytic boosted boson discrimination

Analytic boosted boson discrimination

A general method for the resummation of event-shape distributions in e + e − annihilation

Top Quark Mass Calibration for Monte Carlo Event Generators

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