Exclusive production of ${\rho }^0{\rho }^0$ pairs in ultrarelativistic heavy ion collisions

Abstract

We disuss exclusive electromagnetic production of two neutral ${\rho }^0$~mesons and show the predictions for the $AA\to AA{\rho }^0{\rho }^0$ reactions for gold-gold collisions at the energy of $\sqrt{s}$ = 200 GeV (RHIC) and for lead-lead collisions at the energy of $\sqrt{s}$ = 5.5 TeV (LHC). The elementary cross section is calculated with the help of the vector-dominance-model (VDM)-Regge approach which usually very well describes the experimental data at large $\gamma \gamma$ energy. The low-energy $\gamma \gamma \to {\rho }^0{\rho }^0$ cross section is parametrized. The cross section for nuclear process is calculated by means of the equivalent photon approximation (EPA). We compare the results with realistic charge density with the results for monopole form factor.

Comments: 3 pages, 3 figures, talk by Mariola Klusek-Gawenda at Meson2010, June 2010, Krakow, Poland