Matching NLO QCD and parton showers in heavy flavour production

By Stefano Frixione, P. Nason, Bryan R. Webber. 2003

798 citations recorded by the source corpus.

We apply the MC@NLO approach to the process of heavy flavour hadroproduction. MC@NLO is a method for matching next-to-leading order (NLO) QCD calculations and parton shower Monte Carlo (MC) simulations, with the following features: fully exclusive events are generated, with hadronisation according to the MC model; total rates are accurate to NLO; NLO results for distributions are recovered upon expansion in αS; 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; matching between the hard and soft regions is smooth, and no intermediate integration steps are necessary. The method was applied previously to the hadroproduction of gauge boson pairs, which at NLO involves only initial-state QCD radiation and a unique colour structure. In heavy flavour production, it is necessary to include contributions from final-state QCD radiation and different colour flows. We present illustrative results on top and bottom production at the Tevatron and LHC.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/cd31c4320e9ecd5ca02b4a3e5c73061870607877

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Citations in the corpus

Single-top production in MC@NLO (2005, positive): “The MC@NLO approach [14, 15] (we shall refer to these papers as to I and II respectively hereafter) provides a way of achieving this, by allowing one to match cross sections computed at NLO in QCD with an event generator.”
Search for new phenomena in final states with an energetic jet and large missing transverse momentum in pp collisions at root s=8 TeV with the ATLAS detector (2015, methodology): “06 [68,69] MC generator with parton showers and underlying-event modelling as implemented in HERWIG-6.”
QCD Radiation in the Production of Heavy Colored Particles at the LHC (2008, methodology): “In addition, inclusive top quark pair production with matching has been compared to a next-to-leading order plus parton shower approach (MC@NLO) [16] in Ref.”
Gaugino production in proton-proton collisions at a center-of-mass energy of 8 TeV (2012, methodology): “Moreover, for supersymmetric processes the hard scattering can only be evaluated at tree level, since no SUSY process has so far been implemented into NLO Monte Carlo tools such as MC@NLO [59, 60] or Powheg [61].”
Jet reconstruction and performance using particle flow with the ATLAS Detector (2017, neutral): “03) [32,33] using the CT10 PDF set, interfaced with Herwig (v6.”
The ATLAS Simulation Infrastructure (2010, background): “ATLAS uses the Les Houches Accord PDF Interface (LHAPDF [61]) library which is a replacement for PDFLIB [62] which provides a large repository of PDFs. CTEQ [63] PDFs are used by default (MC@NLO uses NLO PDFs, and all other generators use LO PDFs).”
Herwig++ 2.5 Release Note (2002, background): “The program MC@NLO [14, 15, 16] generates events with • exclusive rates and distributions accurate to next-to-leading order when expanded in αs; • multiple soft/collinear parton emission generated by HERWIG parton showering; • hadronization according to the HERWIG cluster model.”
Jet substructure at the Large Hadron Collider: A review of recent advances in theory and machine learning (2017, methodology): “This is now well-established at NLO, and a variety of different techniques exist and are implemented into standard programs [173, 174, 175, 176, 177, 178, 179, 180, 181].”