/ hep-ex CERN-PH-EP-2015-267

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

Pages: 16

Abstract: We report on the inclusive production cross sections of J/$\psi$, $\psi$(2S), $\Upsilon$(1S), $\Upsilon$(2S) and $\Upsilon$(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 $p_{\rm T}$ and rapidity $y$, over the $p_{\rm T}$ ranges $0<p_{\rm T}<20$ GeV/$c$ for J/$\psi$, $0<p_{\rm T}<12$ GeV/$c$ for all other resonances, and for $2.5<y<4$. The cross sections, integrated over $p_{\rm T}$ and $y$, and assuming unpolarized quarkonia, are $\sigma_{{\rm J}/\psi} = 8.63\pm0.04\pm0.79$ $\mu$b, $\sigma_{\psi{\rm (2S)}} = 1.18\pm0.08\pm0.21$ $\mu$b, $\sigma_{\Upsilon{\rm(1S)}} = 68\pm6\pm7$ nb, $\sigma_{\Upsilon{\rm(2S)}} = 25\pm5\pm4$ nb and $\sigma_{\Upsilon{\rm(3S)}} = 9\pm4\pm1$ nb, where the first uncertainty is statistical and the second one is systematic. These values agree, within at most $1.2\sigma$, with measurements performed by the LHCb collaboration in the same rapidity range.

Note: *Temporary entry*; 16 pages, 4 captioned figures, authors from page 11, submitted to EPJC, figures at http://aliceinfo.cern.ch/ArtSubmission/node/1911

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