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.
Primary author
Jaroslav Adam
(Czech Technical University (CZ))
