Measurement of associated $J/\psi$-$\psi (2S)$ production cross-section in $pp$ collisions at $\sqrt{s}=13$ TeV

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1080

The cross-section of associated $J/\psi$-$\psi (2S)$ production in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}=13$ TeV is measured using a data sample corresponding t…