On two-body and three-body spin correlations in leptonic t(t)over-barZ production and anomalous couplings at the LHC

We study the anomalous t (t) over barZ couplings in the t (t) over barZ production in leptonic final state at the 13 TeV LHC. We use the polarizations of top quarks and Z boson, two-body and three-body spin correlations among the top quarks and Z boson, and the cross section to probe the anomalous couplings. We estimate one parameter and simultaneous limits on the couplings of the effective vertex as well as the effective operators for a set of luminosities 150 fb(-1), 300 fb(-1), 1000 fb(-1), and 3000 fb(-1). The polarizations and the spin correlations are found to be helpful on top of the cross section to better constrain the anomalous couplings.

Automated summary

We study the anomalous t (t) over barZ couplings in the t (t) over barZ production at the 13 TeV LHC with leptonic final states. We utilize polarizations of top quarks and Z boson, two-body and three-body spin correlations, as well as the cross section to investigate the anomalous couplings. We provide parameter and simultaneous limits on the couplings of the effective vertex and effective operators for different luminosities.