Exclusive production of rho^0 rho^0 pairs in gamma-gamma collisions at RHIC

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dc.creatorKłusek, M.
dc.creatorSchäfer, W.
dc.creatorSzczurek, A.
dc.date2009-02-10
dc.date2009-02-11
dc.date.accessioned2026-07-07T13:03:36Z
dc.date.available2026-07-07T13:03:36Z
dc.descriptionWe discuss exclusive electromagnetic production of two neutral $ρ$ mesons in coherent photon-photon processes in ultrarelativistic heavy-ion collisions. The cross section is calculated in the equivalent photon approximation (EPA). Both uncertainties of the flux factors and photon-photon cross sections are discussed in details. We show that inclusion of precise charge densities in nuclei is essential for realistic evaluations of the nuclear photon-photon cross sections. We find that the cross section, especially with realistic flux factors, is sensitive to low energy in the subsystem $γγ\to ρ^0 ρ^0$. The experimental data for the $γγ\to ρ^0 ρ^0$ cross section extracted from $e^+ e^-$ collisions are parametrized and used to estimate the nucleus-nucleus cross section. In addition, we include vector-dominance-model(VDM)--Regge contribution which becomes important at large photon-photon energy. Large nuclear cross sections are obtained. We discuss a possibility of focusing on the large-energy component. We find that both $ρ^0$ mesons are produced predominantly at midrapidities and could be measured by the STAR collaboration at RHIC.
dc.description11 pages, 7 figures; reference added/corrected
dc.identifierhttps://arxiv.org/abs/0902.1689
dc.identifierhttp://arxiv.org/abs/0902.1689
dc.identifierPhys.Lett.B674:92-97,2009
dc.identifierdoi:10.1016/j.physletb.2009.03.006
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/226862
dc.subjectHigh Energy Physics - Phenomenology
dc.titleExclusive production of rho^0 rho^0 pairs in gamma-gamma collisions at RHIC
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