Abstract
During the 2011 Pb-Pb run, dedicated triggers were used by the ALICE Collaboration to enrich ultra-peripheral collisions (UPC) to measure the J/ψ production cross section and its rapidity dependence at a centre of mass energy of 2.76 TeV per nucleon pair. In this article, the ongoing studies on J/ψ photoproduction in UPC events are presented.
Highlights
The suppression of J/ψ in heavy ion collisions at high energies has been reported by several experiments [1,2,3]
The detectors used in this analysis are the VZERO and the Forward Muon Spectrometer (FMS)
The second ultra-peripheral collisions (UPC) trigger was devoted to detect muons in the forward region. This trigger requiered the coincidence of VZERO-C and the single muon trigger, while VZERO-A was used as veto
Summary
The suppression of J/ψ in heavy ion collisions at high energies has been reported by several experiments [1,2,3]. One promising method to study the nuclear gluon shadowing is to measure the heavy vector mesons production in the so called ultra-peripheral collisions (UPC). Two-photon and photonuclear interactions at unprecedentedly high energies can be studied in UPC events at the LHC. In these collisions the nuclei are separated by impact parameters larger than the sum of their radii and hadronic interactions are strongly suppressed (see figure 1). We will focus on results obtained at forward rapidity 1
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