Double-real corrections at $${{\mathcal {O}}(\alpha \alpha _s)}\,$$to single gauge boson production

Bonciani, Roberto; Buccioni, Federico; Mondini, Roberto; Vicini, A.

doi:10.1140/epjc/s10052-017-4728-6

Cited by 38 publications

(30 citation statements)

References 104 publications

(177 reference statements)

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“…is not yet available, although first steps in this direction have been taken by calculating two-loop contributions [77][78][79][80][81], the full O(αα s ) correction to the W/Z-decay widths [82,83], and the full O(α) EW corrections to W/Z+jet production including the W/Z decays [39,40,84].…”

Section: Towards Exact O(αα S ): Assessment Of the Accuracy Of Currenmentioning

confidence: 99%

Precision studies of observables in $$p p \rightarrow W \rightarrow l\nu _l$$ p p → W → l ν l and $$ pp \rightarrow \gamma ,Z \rightarrow l^+ l^-$$ p p → γ , Z → l + l - processes at the LHC

et al. 2017

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This report was prepared in the context of the LPCC Electroweak Precision Measurements at the LHC WG (https://lpcc.web.cern.ch/lpcc/index.php?page=electroweak_ wg) and summarizes the activity of a subgroup dedicated to the systematic comparison of public Monte Carlo codes, which describe the Drell-Yan processes at hadron colliders, in particular at the CERN Large Hadron Collider (LHC). This work represents an important step towards the definition of an accurate simulation framework necessary for very high-precision measurements of electroweak (EW) observables such as the W boson mass and the weak mixing angle. All the codes considered in this report share at least nexta e-mail: alessandro.vicini@mi.infn.it b e-mail: dow@ubpheno.physics.buffalo.edu to-leading-order (NLO) accuracy in the prediction of the total cross sections in an expansion either in the strong or in the EW coupling constant. The NLO fixed-order predictions have been scrutinized at the technical level, using exactly the same inputs, setup and perturbative accuracy, in order to quantify the level of agreement of different implementations of the same calculation. A dedicated comparison, again at the technical level, of three codes that reach next-to-nextto-leading-order (NNLO) accuracy in quantum chromodynamics (QCD) for the total cross section has also been performed. These fixed-order results are a well-defined reference that allows a classification of the impact of higher-order sets of radiative corrections. Several examples of higherorder effects due to the strong or the EW interaction are discussed in this common framework. Also the combination 123 280 Page 2 of 53 Eur. Phys. J. C (2017) 77 :280 of QCD and EW corrections is discussed, together with the ambiguities that affect the final result, due to the choice of a specific combination recipe. All the codes considered in this report have been run by the respective authors, and the results presented here constitute a benchmark that should be always checked/reproduced before any high-precision analysis is conducted based on these codes. In order to simplify these benchmarking procedures, the codes used in this report, together with the relevant input files and running instructions, can be found in a repository at https://twiki.cern.ch/twiki/ bin/view/Main/DrellYanComparison.

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Section: Towards Exact O(αα S ): Assessment Of the Accuracy Of Currenmentioning

confidence: 99%

Precision studies of observables in $$p p \rightarrow W \rightarrow l\nu _l$$ p p → W → l ν l and $$ pp \rightarrow \gamma ,Z \rightarrow l^+ l^-$$ p p → γ , Z → l + l - processes at the LHC

et al. 2017

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“…Analogous resummed calculations have been performed by applying Soft Collinear Effective Theory methods [39][40][41][42][43] and transverse-momentum dependent factorisation [44][45][46][47][48][49][50][51][52]. Electroweak (EW) [53][54][55][56][57][58][59][60][61] and mixed QCD-EW [62][63][64][65][66][67][68] radiative corrections have also been considered. A reliable estimate of the theoretical uncertainties requires various procedures, which also include variations of PDFs, renormalisation and factorisation scales, and SM parameters.…”

Section: Introductionmentioning

confidence: 99%

DYTurbo: fast predictions for Drell–Yan processes

et al. 2020

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Drell-Yan lepton pair production processes are extremely important for Standard Model (SM) precision tests and for beyond the SM searches at hadron colliders. Fast and accurate predictions are essential to enable the best use of the precision measurements of these processes; they are used for parton density fits, for the extraction of fundamental parameters of the SM, and for the estimation of background processes in searches. This paper describes a new numerical program, DYTurbo, for the calculation of the QCD transverse-momentum resummation of Drell-Yan cross sections up to nextto-next-to-leading logarithmic accuracy combined with the fixed-order results at next-to-next-to-leading order (O(α 2 S )), including the full kinematical dependence of the decaying lepton pair with the corresponding spin correlations and the finite-width effects. The DYTurbo program is an improved reimplementation of the DYqT, DYRes and DYNNLO programs, which provides fast and numerically precise predictions through the factorisation of the cross section into production and decay variables, and the usage of quadrature rules based on interpolating functions for the integration over kinematic variables.

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“…Recent works in EW corrections to gauge boson production [12] address this issue, and provide a practical application of higher-order AP splittings. From the theoretical point of view, the mixed QCD-QED splitting kernels are vital ingredients to built the counter-terms that cancel the IR divergences in initial-state radiation, thus allowing to safely compute up to O(α 2 ) contributions.…”

Section: Resultsmentioning

confidence: 99%

Mixed QCD-QED corrections to DGLAP equations

Sborlini¹,

Florian²,

Rodrigo³

2017

Proceedings of 38th International Conference on High Energy Physics — PoS(ICHEP2016)

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We study the mixed effect of QCD and QED corrections to the evolution of parton distribution functions (PDFs). The Altarelli-Parisi splitting functions are extended to one order higher in QED, reaching O(α α 2 S ) accuracy. This also involves extending DGLAP equations to include charge separation effects, that are ignored for pure QCD corrections. Besides that, these effects are crucial for the determination of the photon distribution, which plays an increasingly important role in nowadays phenomenological analysis.

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Double-real corrections at $${{\mathcal {O}}(\alpha \alpha _s)}\,$$to single gauge boson production

Cited by 38 publications

References 104 publications

Precision studies of observables in $$p p \rightarrow W \rightarrow l\nu _l$$ p p → W → l ν l and $$ pp \rightarrow \gamma ,Z \rightarrow l^+ l^-$$ p p → γ , Z → l + l - processes at the LHC

Precision studies of observables in $$p p \rightarrow W \rightarrow l\nu _l$$ p p → W → l ν l and $$ pp \rightarrow \gamma ,Z \rightarrow l^+ l^-$$ p p → γ , Z → l + l - processes at the LHC

DYTurbo: fast predictions for Drell–Yan processes

Mixed QCD-QED corrections to DGLAP equations

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