Speaker
Mr
Daniele De Gruttola
(Centro Fermi Roma and Salerno INFN)
Description
The photoproduction of vector mesons in Ultra-Peripheral Collisions (UPC) is a powerfull tool to probe the nuclear gluon-distribution, for which there is considerable uncertainty in the low-x region. We present the first measurements in Pb-Pb collisions at √s_NN = 2.76 TeV, performed with the ALICE detector. The J/ψ is identified via its dimuon decay in the forward rapidity region and via dimuon and dielectron decay at mid-rapidity. The results are compared to theoretical models for coherent J/ψ production and found to be in good agreement with models which include nuclear gluon shadowing. The cross section measurement for incoherent J/ψ and γγ->e+e- at mid-rapidity will be shown. Finally we present the first results on p-Pb UPC at
√s_NN = 5.02 TeV.
Primary author
Mr
Daniele De Gruttola
(Centro Fermi Roma and Salerno INFN)
