Physical Review C
014910 (7 pages)
Vector mesons may be photoproduced in relativistic heavy-ion collisions when a virtual photon emitted by one nucleus scatters from the other nucleus, emerging as a vector meson. The STAR Collaboration has previously presented measurements of coherent ρ0 photoproduction at center of mass energies of 130 GeV and 200 GeV in AuAu collisions. Here, we present a measurement of the cross section at 62.4 GeV; we find that the cross section for coherent ρ0 photoproduction with nuclear breakup is 10.5 ± 1.5 ± 1.6mb at 62.4 GeV. The cross-section ratio between 200 GeV and 62.4 GeV is 4.4 ± 0.6, less than is predicted by most theoretical models. It is, however, proportionally much larger than the previously observed 15% ± 55% increase between 130 GeV and 200 GeV.
Original Publication Citation
Agakishiev, G., Aggarwal, M. M., Ahammed, Z., Alakhverdyants, A. V., Alekseev, I., Alford, J., . . . Star, C. (2012). ρ0 photoproduction in AuAu collisions at √ sNN root = 62.4 GeV measured with the star detector. Physical Review C, 85(1), 014910. doi:10.1103/PhysRevC.85.014910
Agakishiev, G.; Aggarwal, M. M.; Ahammed, Z.; Alakhverdyants, A. V.; Alekseev, I.; Alford, J.; Anderson, B. D.; Anson, C. D.; Arkhipkin, D.; Bueltmann, S.; Koralt, I.; and Plyku, D., "ρ0 Photoproduction in AuAu Collisions at √ sNN = 62.4 GeV Measured With the STAR Detector" (2012). Physics Faculty Publications. 209.