Exclusive production of rho^0 rho^0 pairs in gamma-gamma collisions at RHIC

Understand

We discuss exclusive electromagnetic production of two neutral $\rho$ mesons in coherent photon-photon processes in ultrarelativistic heavy-ion collisions.

• The cross section is calculated in the equivalent photon approximation (EPA).
• Both uncertainties of the flux factors and photon-photon cross sections are discussed in details.
• We show that inclusion of precise charge densities in nuclei is essential for realistic evaluations of the nuclear photon-photon cross sections.