ρ[superscript 0] photoproduction in AuAu collisions at √sNN=62.4 GeV measured with the STAR detector
Name
Agakishiev-2012-ρ0 photoproduction in AuAu collisions at √sNN
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310.53 KB
Format
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Checksum (MD5)
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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
Date Issued
January 2012
Journal
Physical Review C
Publisher
American Physical Society
Citation
©2012 American Physical Society
Version
Final published version
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevC.85.014910
