rho(0) photoproduction in AuAu collisions at root s(NN)=62.4 GeV measured with the STAR detector

0375567 - ÚJF 2013 RIV US eng J - Journal Article
Agakishiev, G. - Aggarwall, M.M. - Ahammed, Z. - Bielčík, J. - Bielčíková, Jana - Chaloupka, Petr - Chung, Paul - Kapitán, Jan - Kushpil, Vasilij - Rusňák, Jan - Šumbera, Michal - Tlustý, David … Total 370 authors
rho(0) photoproduction in AuAu collisions at root s(NN)=62.4 GeV measured with the STAR detector.
Physical Review. C. Roč. 85, č. 1 (2012), 014910/1-014910/7. ISSN 0556-2813
R&D Projects: GA MŠMT LA09013
Institutional research plan: CEZ:AV0Z10480505
Keywords : HEAVY-ION COLLISIONS * TIME PROJECTION CHAMBER * PHYSICS
Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders
Impact factor: 3.715, year: 2012

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 rho(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 rho(0) 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.
Permanent Link: http://hdl.handle.net/11104/0208183