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

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8 TeV
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We report on the inclusive production cross sections of J/ψ, ψ(2S), Υ(1S), Υ(2S) and Υ(3S), measured at forward rapidity with the ALICE detector in pp collisions at a center-of-mass energy sqrt(s)=8 TeV. The analysis is based on data collected at the LHC during Fall 2012 with an integrated luminosity of 1.28 pb1. Quarkonia are reconstructed in the dimuon-decay channel. The differential production cross sections are measured as a function of the transverse momentum pT and rapidity yover the pT ranges 0 < pT < 20 GeV/c for J/ψ, 0 < pT < 12 GeV/c for all other resonances, and for 2.5 < y < 4. The cross sections, integrated over y and pT, and assuming unpolarized quarkonia, are σJ/ψ = 8.58±0.04±0.83 μb, σψ(2S) = 1.35±0.08±0.22 μb, σΥ(1S) = 67±5±7 nb, σΥ(2S) = 23 ± 5 ± 3 nb and σΥ(3S) = 9 ± 4 ± 2 nb, where the first uncertainty is statistical and the second one is systematic. These values are in reasonable agreement, within 1.2σ, with measurements performed by the LHCb collaboration in the same rapidity range.