NLO QCD matrix elements + parton showers in e+e- -> hadrons

Abstract

We present a new approach to combine multiple NLO parton-level calculations matched to parton showers into a single inclusive event sample. The method provides a description of hard multi-jet configurations at next-to leading order in the perturbative expansion of QCD, and it is supplemented with the all-orders resummed modelling of jet fragmentation provided by the parton shower. The formal accuracy of this technique is discussed in detail, invoking the example of electron-positron annihilation into hadrons. We focus on the effect of renormalisation scale variations in particular. Comparison with experimental data from LEP underlines that this novel formalism describes data with a theoretical accuracy that has hitherto not been achieved in standard Monte Carlo event generators.

19 pages, 8 figures, v2 as published in JHEP

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Cited by in corpus (14)

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• Simulating $b$-associated production of $Z$ and Higgs bosons with SHERPA
• Multi-jet merging in a variable flavor number scheme
• Sgluons in the same-sign lepton searches
• Merging WW and WW+jet with MINLO
• Combining states without scale hierarchies with ordered parton showers
• Investigating the Quantum Properties of Jets and the Search for a Supersymmetric Top Quark Partner with the ATLAS Detector
• Higher-Order Corrections in QCD Evolution Equations and Tools for Their Calculation
• Reducing negative weights in Monte Carlo event generation with Sherpa
• At the Frontier of Precision QCD in the LHC Era
• NLO QCD+EW for V+jets
• Applications of higher order QCD