Measurement of the prompt-production cross-section ratio $\sigma ({\chi }_{c2})/\sigma ({\chi }_{c1})$ in $p$Pb collisions at $\sqrt{s_{NN}}$ = 8.16 TeV

R. Aaij, C. Abellán Beteta, T. Ackernley +954

This Letter reports the first measurement of prompt ${\chi }_{c1}$ and ${\chi }_{c2}$ charmonium production in nuclear collisions at Large Hadron Collider energies. The cross-section ratio $σ(…