Speaker
Jaroslav Adam
(Czech Technical University (CZ))
Description
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.
Author
Jaroslav Adam
(Czech Technical University (CZ))
