Parton showers and matching uncertainties in top quark pair production with Herwig 7

Autor(en)

Kyle Cormier, Simon Plätzer, Christian Reuschle, Peter Richardson, Stephen Webster

Abstrakt

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 LHC 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.

Organisation(en)

Teilchenphysik

Externe Organisation(en)

University of Toronto, Florida State University, Lund University, European Organization for Nuclear Research (CERN), Durham University

Journal

European Physical Journal C

Band

79

Anzahl der Seiten

36

ISSN

1434-6044

Publikationsdatum

11-2019

Peer-reviewed

Ja

ÖFOS 2012

103012 Hochenergiephysik

Schlagwörter

ASJC Scopus Sachgebiete

Engineering (miscellaneous), Physics and Astronomy (miscellaneous)

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/parton-showers-and-matching-uncertainties-in-top-quark-pair-production-with-herwig-7(25e04a75-89f8-4a55-8f5d-697622bf3281).html