Probing the spin correlations of tt¯ production at NLO QCD+EW

Rikkert Frederix, Ioannis Tsinikos, Timea Vitos

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Abstract

In this work we investigate the NLO QCD+EW corrections to the top quark pair production and their effects on the spin correlation coefficients and asymmetries at fixed-order top quark pair production and LO decay in the dilepton channel, within the narrow-width approximation. The spin correlations are implicitly measured through the lepton kinematics. Moreover we study the EW effects to the leptonic differential distributions. We find that the EW corrections to the tt¯ production are within the NLO QCD theoretical uncertainties for the spin correlation coefficients and the leptonic asymmetries. On the other hand, for the differential distributions we find that the EW corrections exceed the NLO QCD scale uncertainty band in the high rapidity regimes and are of the order of the NLO QCD scale uncertainty in the case of invariant mass and transverse momentum distributions.

Original languageEnglish
Article number817
JournalEuropean Physical Journal C
Volume81
Issue number9
DOIs
Publication statusPublished - 2021 Sep

Bibliographical note

Funding Information:
We thank Olivier Mattelaer for discussions regarding MadSpin. IT would like to thank Eleni Vryonidou for useful discussions on the spin correlation coefficient definitions. This work is done in the context of and supported by the Swedish Research Council under contract number 2016-05996. The work of IT is also supported by the MorePheno ERC grant agreement under number 668679. Computational resources to IT have been provided by the Consortium des Équipements de Calcul Intensif (CÉCI), funded by the Fonds de la Recherche Scientifique de Belgique (F.R.S.-FNRS) under Grant No. 2.5020.11 and by the Walloon Region.

Publisher Copyright:
© 2021, The Author(s).

Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.

Subject classification (UKÄ)

  • Subatomic Physics

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