Rikkert Frederix
Senior lecturer
Subleading EW corrections and spin-correlation effects in tt¯ W multi-lepton signatures
Author
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 - Has been reorganised
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