A positive-weight next-to-leading order simulation of weak boson pair production

Hamilton, K.

doi:10.1007/jhep01(2011)009

Cited by 39 publications

(27 citation statements)

References 121 publications

(208 reference statements)

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“…For several processes, Herwig++ incorporates the full NLO corrections in the parton shower [258][259][260] using the POWHEG formalism (Section 5.2.3). An implementation of the CKKW merging scheme for tree-level multi-jet events (Section 5.3) will be included in an upcoming release [81].…”

Section: Hard Processesmentioning

confidence: 99%

General-purpose event generators for LHC physics

et al. 2011

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We review the physics basis, main features and use of general-purpose Monte Carlo event generators for the simulation of proton-proton collisions at the Large Hadron Collider. Topics included are: the generation of hard-scattering matrix elements for processes of interest, at both leading and next-to-leading QCD perturbative order; their matching to approximate treatments of higher orders based on the showering approximation; the parton and dipole shower formulations; parton distribution functions for event generators; non-perturbative aspects such as soft QCD collisions, the underlying event and diffractive processes; the string and cluster models for hadron formation; the treatment of hadron and tau decays; the inclusion of QED radiation and beyond-Standard-Model processes. We describe the principal features of the ARIADNE, Herwig++, PYTHIA 8 and SHERPA generators, together with the Rivet and Professor validation and tuning tools, and discuss the physics philosophy behind the proper use of these generators and tools. This review is aimed at phenomenologists wishing to understand better how parton-level predictions are translated into hadron-level events as well as experimentalists wanting a deeper insight into the tools available for signal and background simulation at the LHC.Comment: 226 pages, 30 figures, submitted to Physics Report

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Section: Hard Processesmentioning

confidence: 99%

General-purpose event generators for LHC physics

et al. 2011

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“…Several Monte Carlo predictions have been obtained in the past years: W + W − production was part of the original proof-of-concept publication of the MC@NLO formalism [62] to match NLO QCD predictions with parton showers (NLO+PS); it was followed by independent NLO+PS computations in Herwig++ [63], Sherpa [64] and Powheg-Box [65,66]. The recent Herwig7 implementation [67,68] includes also single-resonant and gluon-induced contributions, and supersedes the previous Herwig++ prediction.…”

Section: Contentsmentioning

confidence: 99%

NNLOPS accurate predictions for W+W− production

Ré

Wiesemann

Zanderighi

2018

J. High Energ. Phys.

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We present novel predictions for the production of W + W − pairs in hadron collisions that are next-to-next-to-leading order accurate and consistently matched to a parton shower (NNLOPS). All diagrams that lead to the process pp → e −ν e µ + ν µ + X are taken into account, thereby including spin correlations and off-shell effects. For the first time full NNLOPS accuracy is achieved for a 2 → 4 process. We find good agreement, at the 1σ level, with the W + W − rates measured by ATLAS and CMS. The importance of NNLOPS predictions is evident from differential distributions sensitive to soft-gluon effects and from the large impact (10% and more) of including next-to-next-to-leading order corrections on top of MiNLO. We define a charge asymmetry for the W bosons and the leptons in W + W − production at the LHC, which is sensitive to the W polarizations and hence can be used as a probe of new physics.

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“…[5,6], later refined by including leptonic W decays [7,8], and implemented in the Monte Carlo program MCFM [9]. As a first step beyond NLO QCD, the NLO predictions were matched to parton-shower programs without [10] and including [11][12][13][14][15] leptonic W decays. Recently, complete next-to-next-to-leading order (NNLO) QCD predictions were presented [16,17] after a continuous effort over several years [18,19].…”

Section: Jhep06(2016)065mentioning

confidence: 99%

Next-to-leading-order electroweak corrections to pp → W+W− → 4 leptons at the LHC

Biedermann

Billoni

Denner

et al. 2016

J. High Energ. Phys.

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We present results of the first calculation of next-to-leading-order electroweak corrections to W-boson pair production at the LHC that fully takes into account leptonic W-boson decays and off-shell effects. Employing realistic event selections, we discuss the corrections in situations that are typical for the study of W-boson pairs as a signal process or of Higgs-boson decays H → WW * , to which W-boson pair production represents an irreducible background. In particular, we compare the full off-shell results, obtained treating the W-boson resonances in the complex-mass scheme, to previous results in the so-called double-pole approximation, which is based on an expansion of the loop amplitudes about the W resonance poles. At small and intermediate scales, i.e. in particular in angular and rapidity distributions, the two approaches show the expected agreement at the level of fractions of a percent, but larger differences appear in the TeV range. For transverse-momentum distributions, the differences can even exceed the 10% level in the TeV range where "background diagrams" with one instead of two resonant W bosons gain in importance because of recoil effects.

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A positive-weight next-to-leading order simulation of weak boson pair production

Cited by 39 publications

References 121 publications

General-purpose event generators for LHC physics

General-purpose event generators for LHC physics

NNLOPS accurate predictions for W+W− production

Next-to-leading-order electroweak corrections to pp → W+W− → 4 leptons at the LHC

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