Inclusive J/$\psi$ and $\psi$(2S) production in pp collisions at $\sqrt{s} = 7$ TeV at forward rapidity with ALICE at LHC

TL;DR

This paper reports on the measurement of inclusive J/ψ and ψ(2S) production cross-sections and their ratios in proton-proton collisions at 7 TeV using the ALICE detector, providing detailed differential results and comparisons with previous data.

Contribution

First measurement of J/ψ and ψ(2S) production cross-sections and ratios at 7 TeV with ALICE at forward rapidity, including differential distributions and comparison with LHCb.

Findings

Measured integrated cross-sections for J/ψ and ψ(2S)

Determined differential cross-sections in pT and rapidity

Calculated the ψ(2S)/J/ψ production ratio

Abstract

The ALICE collaboration has studied inclusive J/$\psi$ and $\psi$(2S) production at forward rapidities in pp collisions at $\sqrt{s} = 7$ TeV with the ALICE Muon Spectrometer. The analysis has been carried out on a data sample corresponding to an integrated luminosity $\mathcal{L}_{\rm int}$ = 1.35 pb$^{-1}$. The production cross-sections of J/$\psi$ and $\psi$(2S), integrated over \pt\ (0 $<$ \pt\ $<$ 20 GeV/$c$) and \y\ (2.5 $<$ \y\ $<$ 4), have been measured. The J/$\psi$ and $\psi$(2S) differential cross-sections, in transverse momentum and rapidity, have also been measured. The results have been compared with the previous ALICE published results at $\mathcal{L}_{\rm int}$ = 15.6 nb$^{-1}$ and also with the measurement performed by LHCb collaboration. The $\psi$(2S)/J/$\psi$ production ratio (acceptance corrected) integrated over \pt\ and \y\ has been measured. This ratio have also been measured as a function of transverse momentum and rapidity. The ratio as a function of transverse momentum has been compared with the LHCb measurement.