Next-to-leading order matrix elements and truncated showers
Stefan Hoeche, Frank Krauss, Marek Schonherr, Frank Siegert
TL;DR
This paper introduces a novel algorithm that integrates matrix element and parton shower techniques with next-to-leading order calculations, improving the accuracy of simulated particle collision events across various high-energy physics experiments.
Contribution
It presents a new method combining ME+PS and POWHEG approaches, implemented in Sherpa, for more precise event simulation at NLO accuracy.
Findings
Accurate simulation of e+e- annihilation into hadrons at LEP
Improved modeling of Drell-Yan lepton-pair production at Tevatron
Enhanced predictions for Higgs and W+W- production at LHC
Abstract
An algorithm is presented that combines the ME+PS approach to merge sequences of tree-level matrix elements into inclusive event samples with the POWHEG method, which combines exact next-to-leading order matrix elements with parton showers. The quality of the approach and its implementation in Sherpa are exemplified by results for e+e- annihilation into hadrons at LEP, for Drell-Yan lepton-pair production at the Tevatron and for Higgs-boson and W+W- production at LHC energies.
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Taxonomy
TopicsParticle physics theoretical and experimental studies · High-Energy Particle Collisions Research · Quantum Chromodynamics and Particle Interactions