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+νℓl-ν¯lbb¯ at order α4αS2 plus full NLO QCD corrections, where the leptons ℓ and l belong to different families, and b quarks are massive. Thus, the contributions from tt¯ and Wt single-top production, plus contributions without top resonances and all relevant quantum interferences between different channels 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 improvements are especially important for the interpretation of precision measurements of the top-quark mass, for single-top analyses in the Wt channel, and for tt¯ and Wt 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.
Ježo, T., Lindert, J., Nason, P., Oleari, C., & Pozzorini, S. (2016). An NLO+PS generator for tt¯ and Wt production and decay including non-resonant and interference effects. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 76(12).
Citazione: | Ježo, T., Lindert, J., Nason, P., Oleari, C., & Pozzorini, S. (2016). An NLO+PS generator for tt¯ and Wt production and decay including non-resonant and interference effects. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 76(12). |
Tipo: | Articolo in rivista - Articolo scientifico |
Carattere della pubblicazione: | Scientifica |
Presenza di un coautore afferente ad Istituzioni straniere: | Si |
Titolo: | An NLO+PS generator for tt¯ and Wt production and decay including non-resonant and interference effects |
Autori: | Ježo, T; Lindert, J; Nason, P; Oleari, C; Pozzorini, S |
Autori: | OLEARI, CARLO (Penultimo) |
Data di pubblicazione: | 2016 |
Lingua: | English |
Rivista: | THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1140/epjc/s10052-016-4538-2 |
Appare nelle tipologie: | 01 - Articolo su rivista |
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