Measurement of the cross-section ratio $\sigma ({\chi }_{c2})/\sigma ({\chi }_{c1})$ for prompt ${\chi }_c$ production at $\sqrt{s}=7$ TeV

LHCb Collaboration, R. Aaij, C. Abellan Beteta +589

The prompt production of the charmonium ${\chi }_{c1}$ and ${\chi }_{c2}$ mesons has been studied in proton-proton collisions at the Large Hadron Collider at a centre-of-mass energy of $\sqrt{…