ρ0 photoproduction in AuAu collisions at √sNN=62.4 GeV measured with the STAR detector

Agakishiev, G. and Planinić, Mirko and Poljak, Nikola and Zoulkarneeva, Y. (STAR Collaboration) (2012) ρ0 photoproduction in AuAu collisions at √sNN=62.4 GeV measured with the STAR detector. Physical Review C, 85 (1). pp. 14910-7. ISSN 0556-2813

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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 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.

Item Type: Article
Keywords: rho0, photoproduction, collisions, STAR
Date: January 2012
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2012) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 119-0982887-1006
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 05 Jun 2014 11:31
Last Modified: 23 Feb 2016 16:43
URI: http://digre.pmf.unizg.hr/id/eprint/2256

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