Measurement of the ${\eta }_c(1S)$ production cross-section in $pp$ collisions at $\sqrt{s}=13$ TeV

LHCb collaboration, R. Aaij, C. Abellán Beteta +913

Using a data sample corresponding to an integrated luminosity of $2.0f{b}^{-1}$, collected by the LHCb experiment, the production of the ${\eta }_c(1S)$ state in proton-proton collisions…