Abstract
Abstract
We evaluate the theoretical uncertainties in next-to-leading order plus parton shower predictions for top quark pair production and decay in hadronic collisions. Our work is carried out using the Herwig 7 event generator and presents an in-depth study of variations in matching schemes with two systematically different shower algorithms, the traditional angular-ordered and alternative dipole shower. We also present all of the required extensions of the Herwig dipole shower algorithm to properly take into account quark mass effects, as well as its ability to perform top quark decays. The predictions are compared at parton level as well as to Large Hadron Collider data, including in the boosted regime. We find that the regions where predictions with a non-top-quark-specific tune differ drastically from data are plagued by large uncertainties which are consistent between our two shower and matching algorithms.
Funder
Bundesministerium für Bildung und Forschung
European Union H2020 research and innovation programme, European Research Council
European Union FP7, Marie Curie Initial Training Network MCnetITN
European Union H2020 research and innovation programme, Marie Sklodowska-Curie Innovative Training Network MCnetITN3
U.S. Department of Energy
European Union FP7, Marie Curie Intra European Fellowship
Science and Technology Facilities Council
European Union H2020 COST Action, PARTICLEFACE
Publisher
Springer Science and Business Media LLC
Subject
Physics and Astronomy (miscellaneous),Engineering (miscellaneous)
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