Higher Order Corrections to Spin Correlations in Top Quark Pair Production at the LHC

We calculate, for the first time, the next-to-next-to-leading order (NNLO) QCD corrections to spin correlations in top quark pair production at the LHC. The NNLO corrections play an important role in the description of the corresponding differential distributions. We observe that the standard model...

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Published inPhysical review letters Vol. 123; no. 8; p. 082001
Main Authors Behring, Arnd, Czakon, Michał, Mitov, Alexander, Poncelet, Rene, Papanastasiou, Andrew S
Format Journal Article
LanguageEnglish
Published United States 23.08.2019
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Summary:We calculate, for the first time, the next-to-next-to-leading order (NNLO) QCD corrections to spin correlations in top quark pair production at the LHC. The NNLO corrections play an important role in the description of the corresponding differential distributions. We observe that the standard model calculation describes the available Δϕ_{ℓℓ} data in the fiducial region but does not agree with the Δϕ_{ℓℓ} measurement extrapolated to full phase space. Most likely this discrepancy is due to the difference in precision between existing event generators and NNLO calculations for dilepton top-pair final states.
ISSN:1079-7114
DOI:10.1103/PhysRevLett.123.082001