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Measurement of quarkonium production at forward rapidity in \(\mathbf {pp}\)
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The inclusive production cross sections at forward rapidity of \({\mathrm{J}/\psi }\) , \({\psi (\mathrm{2S})}\) , \(\Upsilon \) (1S) and \(\Upsilon \) (2S) are measured in \(\mathrm{pp}\) collisions at \(\sqrt{s}=7~\mathrm{TeV}\) with the ALICE detector at the LHC. The analysis is based on a data sample corresponding to an integrated luminosity of 1.35 pb \(^{-1}\) . Quarkonia are reconstructed in the dimuon-decay channel and the signal yields are evaluated by fitting the \(\mu ^+\mu ^-\) invariant mass distributions. The differential production cross sections are measured as a function of the transverse momentum \({p_\mathrm{T}}\) and rapidity \(y\) , over the ranges \(0 ?GeV/c for \({\mathrm{J}/\psi }\) , \(0 ?GeV/c for all other resonances and for \(2.5 . The measured cross sections integrated over \({p_\mathrm{T}}\) and \(y\) , and assuming unpolarized quarkonia, are: \(\sigma _\mathrm{{\mathrm{J}/\psi }}=6.69\pm 0.04\pm 0.63\) ? \(\upmu \) b, \(\sigma _{\psi (\mathrm{2S})}=1.13\pm 0.07\pm 0.19\) ? \(\upmu \) b, \(\sigma _{\Upsilon (\mathrm{1S})}=54.2\,\pm \, 5.0\pm 6.7\) ?nb and \(\sigma _{\Upsilon (\mathrm{2S})}=18.4\,\pm \,3.7\,\pm \, 2.9\) ?nb, where the first uncertainty is statistical and the second one is systematic. The results are compared to measurements performed by other LHC experiments and to theoretical models.

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