Measurement of forward top pair production in the dilepton channel in $pp$ collisions at $\sqrt{s}=13$ TeV
JHEP 08 (2018) 174, 2018.
The collaboration

Abstract (data abstract)
Measurement of the top pair cross-section in the dilepton channel, where a muon, electron and >= 1 b-jet are required to be present in the event. A fiducial cross-section is measured where the leptons and jets are required to be within the pseudorapidity acceptance of the LHCb acceptance, and to have a transverse momentum greater than 20 GeV. Additionally leptons are required to be separated from each other by a radial distance of 0.1, and from the jet by a distance of 0.5.