Automation of NLO processes and decays and POWHEG matching in WHIZARD

Reuter, Juergen, Chokoufe, Bijan, Hoang, Andre, Kilian, Wolfgang, Stahlhofen, Maximilian, Teubner, Thomas ORCID: 0000-0002-0680-0776 and Weiss, Christian (2016) Automation of NLO processes and decays and POWHEG matching in WHIZARD. .

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Abstract

We give a status report on the automation of next-to-leading order processes within the Monte Carlo event generator WHIZARD, using GoSam and OpenLoops as provider for one-loop matrix elements. To deal with divergences, WHIZARD uses automated FKS subtraction, and the phase space for singular regions is generated automatically. NLO examples for both scattering and decay processes with a focus on e+ e- processes are shown. Also, first NLO-studies of observables for collisions of polarized leptons beams, e.g. at the ILC, will be presented. Furthermore, the automatic matching of the fixed-order NLO amplitudes with emissions from the parton shower within the Powheg formalism inside WHIZARD will be discussed. We also present results for top pairs at threshold in lepton collisions, including matching between a resummed threshold calculation and fixed-order NLO. This allows the investigation of more exclusive differential observables.

Item Type:	Conference or Workshop Item (Unspecified)
Depositing User:	Symplectic Admin
Date Deposited:	23 Jan 2017 10:11
Last Modified:	19 Jan 2023 07:20
DOI:	10.1088/1742-6596/762/1/012059
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3005336