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Top quark modelling in POWHEG BOX


Ježo, Tomáš (2017). Top quark modelling in POWHEG BOX. In: 10th International Workshop on Top Quark Physics, Braga, Portugal, 17 September 2017 - 22 September 2017.

Abstract

We review recent theoretical improvements of Monte Carlo event generators for top-quark pair production and decay at the LHC based on the POWHEG method. We present an event generator that implements spin correlations and off-shell effects in top-decay chains described in terms of exact matrix elements for pp→ℓ+νℓl−ν¯lbb¯ at order α4α2s, including full NLO QCD corrections and interference effects with single-top and non-resonant topologies yielding to the same final state. We then compare its predictions to previous generators that implement NLO corrections only in the top-pair production dynamics. We consider the mass distributions of the WjB and ℓjB systems, proxies for direct top-mass determinations, and jet-vetoed cross section, a probe of the Wt single top contribution.

Abstract

We review recent theoretical improvements of Monte Carlo event generators for top-quark pair production and decay at the LHC based on the POWHEG method. We present an event generator that implements spin correlations and off-shell effects in top-decay chains described in terms of exact matrix elements for pp→ℓ+νℓl−ν¯lbb¯ at order α4α2s, including full NLO QCD corrections and interference effects with single-top and non-resonant topologies yielding to the same final state. We then compare its predictions to previous generators that implement NLO corrections only in the top-pair production dynamics. We consider the mass distributions of the WjB and ℓjB systems, proxies for direct top-mass determinations, and jet-vetoed cross section, a probe of the Wt single top contribution.

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Additional indexing

Item Type:Conference or Workshop Item (Paper), not_refereed, further contribution
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Event End Date:22 September 2017
Deposited On:18 Jan 2019 09:42
Last Modified:07 Apr 2020 07:14
Publisher:arXiv.org
OA Status:Green

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