ρ0 photoproduction in AuAu collisions at √sNN=62.4 GeV measured with the STAR detector (CROSBI ID 189350)
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Podaci o odgovornosti
Agakishiev, G. ; ... ; Planinić, Mirko ; ... ; Poljak, Nikola ; ... ; Zoulkarneeva, Y.
engleski
ρ0 photoproduction in AuAu collisions at √sNN=62.4 GeV measured with the STAR detector
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±1.6 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.
rho0; photoproduction; collisions; STAR
STAR Collaboration
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Podaci o izdanju
85
2012.
014910-1-014910-7
objavljeno
0556-2813
10.1103/PhysRevC.85.014910