The double-differential cross sections of promptly produced J/psi and psi (2S) mesons are measured in pp collisions at root s = 7 TeV, as a function of transverse momentum p (T) and absolute rapidity \. The analysis uses J/psi and psi (2S) dimuon samples collected by the CMS experiment, corresponding to integrated luminosities of 4. 55 and 4. 90 fb (-1), respectively. The results are based on a two-dimensional analysis of the dimuon invariant mass and decay length, and extend to p (T) = 120 and 100 GeV for the J/psi and psi (2S), respectively, when integrated over the interval \ 1. 2. The ratio of the psi (2S) to J/psi cross sections is also reported for \ 1. 2, over the range 10 p (T) 100 GeV. These are the highest p (T) values for which the cross sections and ratio have been measured.
Khachatryan et al. (Thu,) studied this question.