Abstract
Rho mesons are fundamental particles that have been observed in Ultra Peripheral Collisions (UPC's) of relativistic heavy ions. Research is done on Long Island, New York, at Brookhaven National Laboratory at the Relativistic Heavy Ion Collider (RHIC) which smashes beams of ions together at speeds near the speed of light. One type of collision is where two ions miss entirely but an electromagnetic interaction is still produced between the beams, this is called an Ultra Peripheral Collision. STAR, a Solenoidal Tracker At RHIC, has measured the rho photo production cross-sections in UPC's at various energies before. These cross sections serve as a "standard candle" with which to compare the cross sections of more exotic particles. This presentation will discuss how the analysis is done to determine how many rho mesons are produced in UPC's at RHIC.