Precision thrust cumulant moments at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi mathvariant="bold">N</mml:mi><mml:mn>3</mml:mn></mml:msup><mml:mi>LL</mml:mi></mml:math>

Abbate, Riccardo; Fickinger, Michael; Hoang, André H.; Mateu, Vicent; Stewart, Iain W.

doi:10.1103/physrevd.86.094002

Cited by 115 publications

(173 citation statements)

References 80 publications

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“…For the transverse momentum of the vector boson and the related ϕ Ã distribution between the leptons, our default settings with α s ðM Z Þ ¼ 0.118 predict a somewhat harder spectrum. We observe a much better agreement with the data when using a lower value of the strong coupling constant α s ðM Z Þ ¼ 0.1135, as was obtained from fits of N 3 LL 0 resummed calculations of event shapes to LEP data [37][38][39][40]. The same was also observed for resummation observables in our e þ e − results in Ref.…”

Section: Introductionsupporting

confidence: 75%

“…For the latter results, we only change the α s ðM Z Þ value, holding all other parameters including the PDF set fixed. 3 This value is motivated by the fact that all α s ðM Z Þ determinations from LEP data that include higher-order resummation together with some form of analytic treatment of nonperturbative hadronization effects find considerably lower values of α s ðM Z Þ than 0.118 [37][38][39][40][94][95][96]; see also Ref. [97] for determinations from DIS.…”

Section: Comparison To Lhc Datamentioning

confidence: 99%

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Drell-Yan production atNNLL′+NNLOmatched to parton showers

et al. 2015

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We present results for Drell-Yan production from the GENEVA Monte-Carlo framework. We combine the fully differential next-to-next-to leading order (NNLO) calculation with higher-order resummation in the 0-jettiness resolution variable. The resulting parton-level events are further combined with parton showering and hadronization provided by PYTHIA8. The 0-jettiness resummation is carried out to NNLL 0 , which consistently incorporates all singular virtual and real NNLO corrections. It thus provides a natural perturbative connection between the NNLO calculation and the parton shower regime, including a systematic assessment of perturbative uncertainties. In this way, inclusive observables are correct to NNLO, up to small power corrections in the resolution cutoff. Furthermore, the perturbative accuracy of zero-jetlike resummation variables is significantly improved beyond the parton shower approximation. We provide comparisons with LHC measurements of Drell-Yan production at 7 TeV from ATLAS, CMS, and LHCb. As already observed in e þ e − collisions, for resummation-sensitive observables, the agreement with data is noticeably improved by using a lower value of α s ðM Z Þ ¼ 0.1135.

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Section: Introductionsupporting

confidence: 75%

Section: Comparison To Lhc Datamentioning

confidence: 99%

Drell-Yan production atNNLL′+NNLOmatched to parton showers

et al. 2015

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“…The higher-order resummation for 2-jet event shapes in e + e − collisions is very well understood and many precise measurements from LEP exist, which are used, for example, for precise determinations of the strong coupling constant α s [48][49][50][51][52][53][54].…”

Section: Application To E + E − Collisionsmentioning

confidence: 99%

Combining higher-order resummation with multiple NLO calculations and parton showers in GENEVA

Alioli

Bauer

Berggren

et al. 2013

J. High Energ. Phys.

126

163

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Abstract:We extend the lowest-order matching of tree-level matrix elements with parton showers to give a complete description at the next higher perturbative accuracy in α s at both small and large jet resolutions, which has not been achieved so far. This requires the combination of the higher-order resummation of large Sudakov logarithms at small values of the jet resolution variable with the full next-to-leading-order (NLO) matrix-element corrections at large values. As a by-product, this combination naturally leads to a smooth connection of the NLO calculations for different jet multiplicities. In this paper, we focus on the general construction of our method and discuss its application to e + e − and pp collisions. We present first results of the implementation in the Geneva Monte Carlo framework. We employ N -jettiness as the jet resolution variable, combining its next-tonext-to-leading logarithmic resummation with fully exclusive NLO matrix elements, and Pythia 8 as the backend for further parton showering and hadronization. For hadronic collisions, we take Drell-Yan production as an example to apply our construction. For e + e − → jets, taking α s (m Z ) = 0.1135 from fits to LEP thrust data, together with the Pythia 8 hadronization model, we obtain good agreement with LEP data for a variety of 2-jet observables.

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“…Using SCET techniques, Refs. [81] incorporate explicitly the leading non-perturbative power corrections, which are also fitted to the data. They analyse the world data on thrust distributions at NNLO plus N 3 LL accuracy, including a sophisticated infrared renormalon subtraction, obtaining quite low values of the strong coupling.…”

Section: Jet Rates and Event Shapes In E + E − Annihilationmentioning

confidence: 99%

Review of alpha_s determinations

Pich¹

2013

Proceedings of XTH Quark Confinement and the Hadron Spectrum — PoS(Confinement X)

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The present knowledge on the strong coupling is briefly summarized. The most precise determinations of α s , at different energies, are reviewed and compared at the Z mass scale, using the predicted QCD running. The impressive agreement achieved between experimental measurements and theoretical predictions constitutes a beautiful and very significant test of Asymptotic Freedom, establishing QCD as the fundamental theory of the strong interaction. The world average value of the strong coupling is found to be α s (M 2 Z ) = 0.1186 ± 0.0007. Xth Quark Confinement and the Hadron Spectrum

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Precision thrust cumulant moments atN3LL

Cited by 115 publications

References 80 publications

Drell-Yan production atNNLL′+NNLOmatched to parton showers

Drell-Yan production atNNLL′+NNLOmatched to parton showers

Combining higher-order resummation with multiple NLO calculations and parton showers in GENEVA

Review of alpha_s determinations

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