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An NLO+PS generator for tt ̄ and W t production and decay including non-resonant and interference effects


Ježo, Tomáš; Lindert, Jonas M; Nason, Paolo; Oleari, Carlo; Pozzorini, Stefano (2016). An NLO+PS generator for tt ̄ and W t production and decay including non-resonant and interference effects. European Physical Journal C - Particles and Fields, 76(12):691.

Abstract

We present a Monte Carlo generator that implements significant theoretical improvements in the simulation of top-quark pair production and decay at the LHC. Spin correlations and off-shell effects in top-decay chains are described in terms of exact matrix elements for pp → l+νl l−ν ̄l b ̄b at NLO QCD, where the leptons l and l belong to different families, and b quarks are massive. Thus, the contributions from tt ̄ and W t single-top production as well as their quantum interference are fully included. Matrix elements are matched to the Pythia8 parton shower using a recently proposed method that allows for a consistent treatment of resonances in the POWHEG framework. These theoretical improve- ments are especially important for the interpretation of precision measurements of the top-quark mass, for single-top analyses in the W t channel, and for tt ̄ and W t backgrounds in the presence of jet vetoes or cuts that enhance off-shell effects. The new generator is based on a process-independent interface of the OpenLoops amplitude generator with the POWHEG-BOX framework.

Abstract

We present a Monte Carlo generator that implements significant theoretical improvements in the simulation of top-quark pair production and decay at the LHC. Spin correlations and off-shell effects in top-decay chains are described in terms of exact matrix elements for pp → l+νl l−ν ̄l b ̄b at NLO QCD, where the leptons l and l belong to different families, and b quarks are massive. Thus, the contributions from tt ̄ and W t single-top production as well as their quantum interference are fully included. Matrix elements are matched to the Pythia8 parton shower using a recently proposed method that allows for a consistent treatment of resonances in the POWHEG framework. These theoretical improve- ments are especially important for the interpretation of precision measurements of the top-quark mass, for single-top analyses in the W t channel, and for tt ̄ and W t backgrounds in the presence of jet vetoes or cuts that enhance off-shell effects. The new generator is based on a process-independent interface of the OpenLoops amplitude generator with the POWHEG-BOX framework.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2016
Deposited On:03 Jan 2017 08:33
Last Modified:23 Sep 2018 06:04
Publisher:Springer
ISSN:1434-6044
OA Status:Gold
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1140/epjc/s10052-016-4538-2

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Download PDF  'An NLO+PS generator for tt ̄ and W t production and decay including non-resonant and interference effects'.
Preview
Filetype: PDF
Size: 2MB
Licence: Creative Commons: Attribution 4.0 International (CC BY 4.0)