Multiplicity dependence of ${\sigma }_{\psi (2S)}/{\sigma }_{J/\psi }$ in $pp$ collisions at $\sqrt{s}=13$ TeV

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1087

The ratio of production cross-sections of $\psi (2S)$ over $J/\psi$ mesons as a function of charged-particle multiplicity in proton-proton collisions at a centre-of-mass energy $\sqrt{s}=…