ρ[superscript 0] photoproduction in AuAu collisions at √sNN=62.4 GeV measured with the STAR detector
Author(s)
Balewski, Jan T.; Betancourt, Michael Joseph; Corliss, Ross Cameron; Hays-Wehle, James Prewitt; Leight, William Axel; Surrow, Bernd; Walker, Margaret R.; Milner, Richard G; Redwine, Robert P; Seele, Joseph Patrick; Steadman, Stephen G; van Nieuwenhuizen, Gerrit J; ... Show more Show less![Thumbnail](/bitstream/handle/1721.1/72103/Agakishiev-2012-%cf%810%20photoproduction%20in%20AuAu%20collisions%20at%20%e2%88%9asNN.jpg?sequence=7&isAllowed=y)
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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 ρ[superscript 0] 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 ρ[superscript 0] photoproduction with nuclear breakup is 10.5±1.5±1.6 mb 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.
Date issued
2012-01Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear ScienceJournal
Physical Review C
Publisher
American Physical Society
Citation
©2012 American Physical Society
Version: Final published version
ISSN
0556-2813
1089-490X