Coherent Vector Meson Production in Ultra-Peripheral Heavy-Ion Collisions at STAR
Abstract
We report the first observation of coherent rho0 production (AuAu->AuAu rho0) and rho0 production accompanied by mutual nuclear Coulomb excitation (AuAu->Au*Au*rho0),and the observation of coherent e+e- pair production (AuAu->Au*Au*e+e-) in ultra-peripheral relativistic heavy-ion collisions (UPCs). We give transverse momentum, mass, and rapidity distributions. The cross sections for coherent rho0 production at sqrtsNN=130 and 200 GeV are in agreement with theoretical predictions, which treat rho0 production and nuclear excitation as independent processes.
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