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Photo of Rikkert Frederix

Rikkert Frederix

Senior lecturer

Photo of Rikkert Frederix

Subleading EW corrections and spin-correlation effects in tt¯ W multi-lepton signatures

Author

  • Rikkert Frederix
  • Ioannis Tsinikos

Summary, in English

Recently a slight tension between data and predictions has been reported in tt¯ W production by both the CMS and ATLAS collaborations. We revisit the theoretical predictions for this process, focussing on the following two effects. We disentangle various effects that lead to asymmetries among the leptonic decay products of the (anti-)top quarks and W bosons, for which we find that the spin correlations in the top-quark pair are the dominant source. We also discuss the impact of the large, formally subleading, electroweak corrections to tt¯ W production at the LHC. We find that this effect changes the tt¯ W cross section significantly in the signature phase-space regions, and should therefore be included differentially in the theory to data comparisons.

Department/s

  • Theoretical Particle Physics

Publishing year

2020

Language

English

Publication/Series

European Physical Journal C

Volume

80

Issue

9

Document type

Journal article

Publisher

Springer

Topic

  • Subatomic Physics

Status

Published

ISBN/ISSN/Other

  • ISSN: 1434-6044