Coherent rho(0) production in ultraperipheral heavy-ion collisions

Phys Rev Lett. 2002 Dec 30;89(27):272302. doi: 10.1103/PhysRevLett.89.272302. Epub 2002 Dec 20.

Abstract

The STAR Collaboration reports the first observation of exclusive rho(0) photoproduction, AuAu-->AuAurho(0), and rho(0) production accompanied by mutual nuclear Coulomb excitation, AuAu-->Au*Au*rho(0), in ultraperipheral heavy-ion collisions. The rho(0) have low transverse momenta, consistent with coherent coupling to both nuclei. The cross sections at sqrt[s(NN)]=130 GeV agree with theoretical predictions treating rho(0) production and Coulomb excitation as independent processes.