Improved Parton Showers at Large Transverse Momenta
Richard Corke, Torbj\"orn Sj\"ostrand
TL;DR
This paper enhances parton shower models at high transverse momenta by developing reweighting schemes that improve matching with NLO generators and correct default behaviors based on matrix-element comparisons.
Contribution
It introduces reweighting schemes for the first emission to improve matching of POWHEG with Pythia and corrects shower behavior at large transverse momenta.
Findings
Improved matching between POWHEG and Pythia.
Enhanced accuracy of shower models at high transverse momenta.
Better agreement with real-emission matrix elements.
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.
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