Measurement of J / ψ and ψ ( 2 S ) Prompt Double-Differential Cross Sections in p p Collisions at √ s = 7 TeV

Abstract

The double-differential cross sections of promptly produced J / ψ and ψ ( 2 S ) mesons are measured in p p collisions at √ s = 7 TeV , as a function of transverse momentum p T and absolute rapidity | y | . The analysis uses J / ψ and ψ ( 2 S ) 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 / ψ and ψ ( 2 S ) , respectively, when integrated over the interval | y | < 1.2 . The ratio of the ψ ( 2 S ) to J / ψ cross sections is also reported for | y | < 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.