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

The collaboration
Eur.Phys.J. C76 (2016) 184, 2016

Abstract (data abstract)
CERN-LHC. 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 1.23 pb$^{-1}$. Quarkonia are reconstructed in the dimuon-decay channel. The differential production cross sections are measured as a function of the transverse momentum $p_{\rm T}$ 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 $y$ and $p_{\rm T}$, and assuming unpolarized quarkonia, are $\sigma_{\text{J}/\psi} = 8.98 \pm 0.04 \pm 0.82$ $\mu$b, $\sigma_{\psi\text{(2S)}} = 1.23 \pm 0.08 \pm 0.22$ $\mu$b, $\sigma_{\Upsilon\text{(1S)}} = 71 \pm 6 \pm 7$ nb, $\sigma_{\Upsilon\text{(2S)}} = 26 \pm 5 \pm 4$ nb and $\sigma_{\Upsilon\text{(3S)}} = 9 \pm 4 \pm 1$ 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.

• #### Table 1

Data from Figure 2a

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Differential production cross sections of J/$\psi$ as a function of $p_{\rm T}$.

• #### Table 2

Data from Figure 2b

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Differential production cross sections of J/$\psi$ as a function of rapidity.

• #### Table 3

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integrated production cross section of J/$\psi$.

• #### Table 4

Data from Figure 2c

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Differential production cross sections of $\psi$(2S) as a function of $p_{\rm T}$.

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Data from Figure 2d

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Differential production cross sections of $\psi$(2S) as a function of rapidity.

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integrated production cross section of $\psi$(2S).

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Data from Figure 3a

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Differential production cross sections of $\Upsilon$(1S) as a function of $p_{\rm T}$.

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Data from Figure 3b

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Differential production cross sections of $\Upsilon$(1S) as a function of rapidity.

• #### Table 9

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integrated production cross section of $\Upsilon$(1S).

• #### Table 10

Data from Figure 3b

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Differential production cross sections of $\Upsilon$(2S) as a function of rapidity.

• #### Table 11

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integrated production cross section of Upsilon (2S).

• #### Table 12

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integrated production cross section of Upsilon (3S).

• #### Table 13

Data from Figure 4a

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$\psi$(2S) over J/$\psi$ ratio as a function of $p_{\rm T}$.

• #### Table 14

Data from Figure 4b

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$\psi$(2S) over J/$\psi$ ratio as a function of rapidity.

• #### Table 15

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integrated $\psi$(2S) over J/$\psi$ production cross section ratio.

• #### Table 16

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integrated $\Upsilon$(2S) over $\Upsilon$(1S) production cross section ratio.

• #### Table 17

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integrated $\Upsilon$(3S) over $\Upsilon$(1S) production cross section ratio.