Inclusive J/psi production in pp collisions at sqrt(s) = 2.76 TeV

TL;DR

This paper reports measurements of inclusive J/psi production in proton-proton collisions at 2.76 TeV at the LHC, covering different rapidity ranges and comparing results with higher energy data and theoretical models.

Contribution

First measurement of inclusive J/psi production at 2.76 TeV in two rapidity regions, providing data for understanding quarkonium production mechanisms.

Findings

Measured differential cross sections for J/psi production.

Compared results with 7 TeV data and theoretical predictions.

Provided data across different rapidity and transverse momentum ranges.

Abstract

The ALICE Collaboration has measured inclusive J/psi production in pp collisions at a center of mass energy sqrt(s)=2.76 TeV at the LHC. The results presented in this Letter refer to the rapidity ranges |y|<0.9 and 2.5<y<4 and have been obtained by measuring the electron and muon pair decay channels, respectively. The integrated luminosities for the two channels are L^e_int=1.1 nb^-1 and L^mu_int=19.9 nb^-1, and the corresponding signal statistics are N_J/psi^e+e-=59 +/- 14 and N_J/psi^mu+mu-=1364 +/- 53. We present dsigma_J/psi/dy for the two rapidity regions under study and, for the forward-y range, d^2sigma_J/psi/dydp_t in the transverse momentum domain 0<p_t<8 GeV/c. The results are compared with previously published results at sqrt(s)=7 TeV and with theoretical calculations.