Tomáš Ježo
New NLOPS predictions for tt¯+btt¯+b -jet production at the LHC
Ježo, Tomáš; Lindert, Jonas M.; Moretti, Niccolo; Pozzorini, Stefano
Authors
Jonas M. Lindert
Niccolo Moretti
Stefano Pozzorini
Abstract
Measurements of tt¯H production in the H→bb¯ channel depend in a critical way on the theoretical uncertainty associated with the irreducible tt¯+b -jet background. In this paper, analysing the various topologies that account for b-jet production in association with a tt¯ pair, we demonstrate that the process at hand is largely driven by final-state g→bb¯ splittings. We also show that in five-flavour simulations based on tt¯+ multi-jet merging, b-jet production is mostly driven by the parton shower, while matrix elements play only a marginal role in the description of g→bb¯ splittings. Based on these observations we advocate the use of NLOPS simulations of pp→tt¯bb¯ in the four-flavour scheme, and we present a new Powheg generator of this kind. Predictions and uncertainties for tt¯+b -jet observables at the 13 TeV LHC are presented both for the case of stable top quarks and with spin-correlated top decays. Besides QCD scale variations we consider also theoretical uncertainties related to the Powheg matching method and to the parton shower modelling, with emphasis on g→bb¯ splittings. In general, matching and shower uncertainties turn out to be remarkably small. This is confirmed also by a consistent comparison against Sherpa+OpenLoops.
Citation
Ježo, T., Lindert, J. M., Moretti, N., & Pozzorini, S. (2018). New NLOPS predictions for tt¯+btt¯+b -jet production at the LHC. The European Physical Journal C, 78(6), Article 502. https://doi.org/10.1140/epjc/s10052-018-5956-0
Journal Article Type | Article |
---|---|
Acceptance Date | May 31, 2018 |
Online Publication Date | Jun 18, 2018 |
Publication Date | Jun 18, 2018 |
Deposit Date | Jun 28, 2018 |
Publicly Available Date | Jun 28, 2018 |
Journal | European Physical Journal C: Particles and Fields |
Print ISSN | 1434-6044 |
Electronic ISSN | 1434-6052 |
Publisher | SpringerOpen |
Peer Reviewed | Peer Reviewed |
Volume | 78 |
Issue | 6 |
Article Number | 502 |
DOI | https://doi.org/10.1140/epjc/s10052-018-5956-0 |
Public URL | https://durham-repository.worktribe.com/output/1356069 |
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Copyright Statement
© The Author(s) 2018.
This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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