Rapidity and transverse momentum dependence of inclusive J/$\psi$ production in pp collisions at $\sqrt{s}=7$ TeV

Abstract

The ALICE experiment at the LHC has studied inclusive J/$\psi$ production at central and forward rapidities in pp collisions at $\sqrt{s}=7$ TeV. In this Letter, we report on the first results obtained detecting the J/$\psi$ through its dilepton decay into $e^{+}{e}^{-}$ and ${\mu }^{+}{\mu }^{-}$ pairs in the rapidity range |y|<0.9 and 2.5<y<4, respectively, and with acceptance down to zero $p_{\mathrm{T}}$. In the dielectron channel the analysis was carried out on a data sample corresponding to an integrated luminosity $L_{\mathrm{int}}$ = 5.6 nb${}^{-1}$ and the number of signal events is $N_{J/\psi }=352\pm 32$ (stat.) $\pm$ 28 (syst.); the corresponding figures in the dimuon channel are $L_{\mathrm{int}}$ = 15.6 nb${}^{-1}$ and $N_{J/\psi }=1924\pm 77$ (stat.) $\pm$ 144(syst.). The measured production cross sections are ${\sigma }_{J/\psi }$ (|y|<0.9) = 12.4 $\pm$ 1.1 (stat.) $\pm$ 1.8 (syst.) + 1.8 -2.7 (syst.pol.) $\mu$b and ${\sigma }_{J/\psi }$ (2.5<y<4) = 6.31 $\pm$ 0.25 (stat.) $\pm$ 0.76 (syst.) +0.95 -1.96 (syst.pol.) $\mu$b. The differential cross sections, in transverse momentum and rapidity, of the J/$\psi$ were also measured.

24 pages, 7 captioned figures, 2 tables, published version including erratum changes, figures at http://aliceinfo.cern.ch/ArtSubmission/node/3066

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