Transverse momentum distribution of vector mesons produced in ultraperipheral relativistic heavy ion collisions.
We study the transverse momentum distribution of vector mesons produced in ultraperipheral relativistic heavy ion collisions (UPCs). In UPCs there is no strong interaction between the nuclei, and the vector mesons are produced in photon-nucleus collisions where the (quasireal) photon is emitted from the other nucleus. Exchanging the role of both ions leads to interference effects. A detailed study of the transverse momentum distribution, which is determined by the transverse momentum of the emitted photon, the production process on the target, and the interference effect, is done. We study the unrestricted cross section and the one with an additional electromagnetic excitation of one or both ions; in the latter case small impact parameters are emphasized.
Institut für Physik, Universität Basel, 4056 Basel, Switzerland.
Kai
K
Hencken
Gerhard
G
Baur
Dirk
D
Trautmann