Inclusive quarkonium production at forward rapidity in pp collisions at $$\mathbf {\sqrt{s}=8}~$$ s = 8 TeV

Abstract

We report on the inclusive production cross sections of J/, (2S), (1S), (2S) and (3S), measured at forward rapidity with the ALICE detector in pp collisions at a center-of-mass energy s = 8 TeV. The analysis is based on data collected at the LHC and corresponds to an integrated luminosity of 1.23 pb -1 . Quarkonia are reconstructed in the dimuon-decay channel. The differential production cross sections are measured as a function of the transverse momentum p T and rapidity y, over the p T ranges 0 < p T < 20 GeV/c for J/, 0 < p T < 12 GeV/c for all other resonances, and for 2.5 < y < 4. The cross sections, integrated over p T and y, and assuming unpolarized quarkonia, are J/ = 8.98 0.04 0.82 b, (2S) = 1.23 0.08 0.22 b, (1S) = 71 6 7 nb, (2S) = 26 5 4 nb and (3S) = 9 4 1 nb, where the first uncertainty is statistical and the second one is systematic. These values agree, within at most 1.4 , with measurements performed by the LHCb collaboration in the same rapidity range.