Charmonium and e+e- pair photoproduction at mid-rapidity in ultra-peripheral Pb-Pb collisions at √sNN= 2.76 TeV

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2.76 TeV
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The ALICE collaboration measured the J/psi photoproduction at LHC in Pb-Pb collisions 

at sqrt_{s}=2.76 TeV. The J/psi is identified via  its dimuon and dielectron decay in the

pseudorapidity region |eta|<0.9. The analysis is based on an event sample corresponding to a luminosity

of 25 micobarn-1. The result is compared to theoretical models for j/psi production.