Eur. Phys. J. C 69, 1-18 (2010)
https://doi.org/10.1140/epjc/s10052-010-1409-0

Improved parton showers at large transverse momenta

Theoretical High Energy Physics, Department of Astronomy and Theoretical Physics, Lund University, Sölvegatan 14A, 223 62, Lund, Sweden

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Received: 15 March 2010
Revised: 3 June 2010
Published online: 12 August 2010

Abstract

Several methods to improve the parton-shower description of hard processes by an injection of matrix-element-based information have been presented over the years. In this article we study (re)weighting schemes for the first/hardest emission. One objective is to provide a consistent matching of the POWHEG next-to-leading order generator to the PYTHIA shower algorithms. Another is to correct the default behaviour of these showers at large transverse momenta, based on a comparison with real-emission matrix elements.