Matching NLO QCD computations and parton shower simulations

By Stefano Frixione, Bryan R. Webber. 2002

2,210 citations recorded by the source corpus.

We propose a method for matching the next-to-leading order (NLO) calculation of a given QCD process with a parton shower Monte Carlo (MC) simulation. The method has the following features: fully exclusive events are generated, with hadronization according to the MC model; total exclusive rates are accurate to NLO; NLO results for distributions are recovered upon expansion in ?s; hard emissions are treated as in NLO computations while soft/collinear emissions are handled by the MC simulation, with the same logarithmic accuracy as the MC; and matching between the hard- and soft/collinear-emission regions is smooth. A fraction of events with negative weight is generated, but unweighting remains possible with reasonable efficiency. The method is clarified using a simple toy model, and illustrated by application to the hadroproduction of W+W? pairs.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/ed65284ed2eb8bb1ddd7805bff22a477a03d91e2

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Nuclear and High Energy Physics

Citations in the corpus

Performance of CMS muon reconstruction in pp collision events at √s = 7 TeV (2012, methodology): “For comparison with these events, the beauty production cross section given by PYTHIA has been rescaled to the NLO QCD predictions [24, 25], which were shown to describe recent CMS measurements well [26, 27].”
The automation of next-to-leading order electroweak calculations (2018, methodology): “Finally, in the case of matching with parton showers, the MC@NLO formalism [63] is employed.”
Parton showers with quantum interference (2007, background): “Thus a complete color string configuration for a quark, an antiquark, and five gluons might be {[1, 6, 3, 7], (4, 2, 5)}.”
Jet pair production in POWHEG (2010, methodology): “viable through the invention of the MC@NLO [6] and POWHEG [7, 8] methods.”
Les Houches 2017: Physics at TeV Colliders Standard Model Working Group Report (2017, methodology): “A detailed tuned comparison of these amplitude generators for the production of the 4` and 2`2ν final states (off-shell ZZ and WW production) is presented at the level of amplitudes, and in combination with the Monte Carlo integration frameworks BBMC, MoCaNLO, Munich, Sherpa and Madgraph5_aMC@NLO at”
The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations (2014, methodology): “At the NLO (as opposed to the NNLO and beyond) there is the further advantage that fixed-order computations can be matched to parton-shower event generators (with either the MC@NLO [26] or the POWHEG [27] method — see also refs.”
Scalar and pseudoscalar Higgs production in association with a top–antitop pair (2011, result): “We have also matched our NLO results with parton showers using the MC@NLOmethod [26].”