Matching NLO QCD computations with parton shower simulations: the POWHEG method

Frixione, Stefano; Nason, Paolo; Oleari, C.

doi:10.1088/1126-6708/2007/11/070

Cited by 2,267 publications

(2,091 citation statements)

References 41 publications

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“…The ZZ=Zγ Ã and WZ=Wγ Ã diboson processes are simulated using POWHEG [45][46][47][48], including off-shell photon contributions and internal conversion events where two leptons are produced from photon radiation in the final state. The gg → ZZ=Zγ Ã process is simulated separately, but does not include the ZZ=Zγ Ã → 4τ process, which is estimated to be negligible in the signal regions used in this analysis.…”

Section: Monte Carlo Simulationsmentioning

confidence: 99%

Search for supersymmetry in events with four or more leptons ins=8 TeVppcollisions with the ATLAS detector

et al. 2014

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Results from a search for supersymmetry in events with four or more leptons including electrons, muons and taus are presented. The analysis uses a data sample corresponding to 20.3 fb −1 of proton-proton collisions delivered by the Large Hadron Collider at ffiffi ffi s p ¼ 8 TeV and recorded by the ATLAS detector.Signal regions are designed to target supersymmetric scenarios that can be either enriched in or depleted of events involving the production of a Z boson. No significant deviations are observed in data from standard model predictions and results are used to set upper limits on the event yields from processes beyond the standard model. Exclusion limits at the 95% confidence level on the masses of relevant supersymmetric particles are obtained. In R-parity-violating simplified models with decays of the lightest supersymmetric particle to electrons and muons, limits of 1350 and 750 GeV are placed on gluino and chargino masses, respectively. In R-parity-conserving simplified models with heavy neutralinos decaying to a massless lightest supersymmetric particle, heavy neutralino masses up to 620 GeV are excluded. Limits are also placed on other supersymmetric scenarios.

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Section: Monte Carlo Simulationsmentioning

confidence: 99%

Search for supersymmetry in events with four or more leptons ins=8 TeVppcollisions with the ATLAS detector

et al. 2014

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“…In addition we also study how including parton distribution functions (pdfs) and NLO corrections change the differential spectra by comparing normalized projections obtained from our analytic expression to Monte Carlo generated by POWHEG [34][35][36][37] and Madgraph [17]. We first separate the background into its various components which we define as the following, A. s-channel 2e2µ process…”

Section: The Differential Spectramentioning

confidence: 99%

Scrutinizing the Higgs signal and background in the 2e2μ golden channel

Chen

Tran

Vega-Morales

2013

J. High Energ. Phys.

135

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Kinematic distributions in the decays of the newly discovered resonance to four leptons are a powerful probe of the tensor structure of its couplings to electroweak gauge bosons. We present analytic calculations for both signal and background of the fully differential cross section for the 'Golden Channel' e + e − µ + µ − final state. We include all interference effects between intermediate gauge bosons and allow them to be on-or off-shell. For the signal we compute the fully differential decay width for general scalar couplings to ZZ, γγ, and Zγ. For the background we compute the leading order fully differential cross section for qq annihilation into Z and γ gauge bosons, including the contribution from the resonant Z → 2e2µ process. We also present singly and doubly differential projections and study the interference effects on the differential spectra. These expressions can be used in a variety of ways to uncover the nature of the newly discovered resonance or any new scalars decaying to neutral gauge bosons which might be discovered in the future.

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“…In this case, an all-order resummation of soft-gluon effects is needed to get a consistent result. Such resummation was considered for electron-proton collision in [33] and it is incorporated in the POWHEG method [34,35]. Having soft gluon resummation built in through the parton showering, the POWHEG predictions for dijet production in proton-proton collisions exhibit a monotonic decrease with ∆, in contrast to the NLO case, see [32].…”

Section: Discussionmentioning

confidence: 99%

Mueller–Navelet small-cone jets at LHC in next-to-leading BFKL

et al. 2013

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We consider within QCD collinear factorization the process p + p → jet + jet + X, where two forward high-p T jets are produced with a large separation in rapidity ∆y (Mueller-Navelet jets). In this case the (calculable) hard part of the reaction receives large higher-order corrections ∼ α n s (∆y) n , which can be accounted for in the BFKL approach with next-to-leading logarithmic accuracy, including contributions ∼ α n s (∆y) n−1 . We calculate several observables related with this process, using the next-to-leading order jet vertices, recently calculated in the approximation of small aperture of the jet cone in the pseudorapidity-azimuthal angle plane. †

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Matching NLO QCD computations with parton shower simulations: the POWHEG method

Cited by 2,267 publications

References 41 publications

Search for supersymmetry in events with four or more leptons ins=8 TeVppcollisions with the ATLAS detector

Search for supersymmetry in events with four or more leptons ins=8 TeVppcollisions with the ATLAS detector

Scrutinizing the Higgs signal and background in the 2e2μ golden channel

Mueller–Navelet small-cone jets at LHC in next-to-leading BFKL

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