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

Abstract

We report on the inclusive production cross sections of J/$\psi$, $\psi$(2S), ${\rm Y}$(1S), ${\rm Y}$(2S) and ${\rm Y}$(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 and corresponds to an integrated luminosity of 1.28 pb${}^{-1}$. Quarkonia are reconstructed in the dimuon-decay channel. The differential production cross sections are measured as a function of the transverse momentum $p_{\mathrm{T}}$ and rapidity $y$, over the $p_{\mathrm{T}}$ ranges $0<p_{\mathrm{T}}<20$ GeV/$c$ for J/$\psi$, $0<p_{\mathrm{T}}<12$ GeV/$c$ for all other resonances, and for $2.5<y<4$. The cross sections, integrated over $p_{\mathrm{T}}$ and $y$, and assuming unpolarized quarkonia, are ${\sigma }_{\mathrm{J}/\psi }=8.98\pm 0.04\pm 0.82$ $\mu$b, ${\sigma }_{\psi (2S)}=1.23\pm 0.08\pm 0.22$ $\mu$b, ${\sigma }_{{\rm Y}(1S)}=71\pm 6\pm 7$ nb, ${\sigma }_{{\rm Y}(2S)}=26\pm 5\pm 4$ nb and ${\sigma }_{{\rm Y}(3S)}=9\pm 4\pm 1$ nb, where the first uncertainty is statistical and the second one is systematic. These values agree, within at most $1.4\sigma$, with measurements performed by the LHCb collaboration in the same rapidity range.

17 pages, 4 captioned figures, 2 tables, authors from page 12, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/1911

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