ALICE results on ultra-peripheral p-Pb and Pb-Pb collisions

29 Apr 2015, 09:45


WG2 Small-x, Diffraction and Vector Mesons WG2 Small-x, Diffraction and Vector Mesons


Jaroslav Adam (Czech Technical University (CZ))


Ultra-relativistic heavy ions generate strong electromagnetic fields, which offer the possibility to study gamma-gamma, gamma-nucleus and gamma-proton processes at the LHC in ultra-peripheral Pb-Pb and p-Pb collisions (UPC). Exclusive photoproduction of vector mesons is sensitive to the gluon distribution of the interacting target (proton or nucleus). The reactions allow one to study saturation phenomena (p-Pb) and nuclear gluon shadowing (Pb-Pb). Here we present results from the ALICE measurement of coherent photoproduction in Pb-Pb UPC at sqrt(s_NN) = 2.76 TeV of J/psi mesons at forward and central rapidity and rho0 and psi(2S) mesons at central rapidity. Furthermore, we also show our results on the J/psi photoproduction in p-Pb UPC at sqrt(s_NN) = 5.02 TeV in the forward and backward rapidities where the rapidity is measured in the laboratory frame with respect to the proton beam direction.

Primary author

Jaroslav Adam (Czech Technical University (CZ))

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