PHENIX first measurement of J/Psi elliptic flow parameter v2 in Au-Au collisions at sqrt(s) = 200 GeV

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Recent results indicate that the J/ψ suppression pattern differs with rapidity showing a larger suppression at forward rapidity. J/ψ suppression mechanisms based on energy density (such as color screening, interaction with co-movers, etc) predict the opposite trend. However, it is expected that more pairs should be available to form quarkonia at mid-rapidity via recombination. Some models provide a way to differentiate J/ψ production from initially produced pairs and final state recombination of uncorrelated pairs, via the rapidity and transverse momentum dependence of the elliptic flow (v2). During 2007 data taking at RHIC, a large sample of Au+Au collisions at 200 GeV was collected. The statistics has been increased compared to the previous 2004 data set, thus allowing a more precise measurement of the J/ψ production at both mid and forward rapidity. Furthermore, the PHENIX experiment benefited from the addition of a new detector, which improves the reaction plane resolution and allows us to measure the J/ψv2. Comparing this measurement to the positive D-mesons v2 (through non-photonic electron decays) will help in constraining the J/ψ production mechanisms and getting a more precise picture of the proportion of J/ψ coming from direct production or charm quark coalescence. Details on how the J/ψv2 is measured at mid-rapidity are presented. The J/ψv2 as a function of transverse momentum are compared with the existing models.


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Ämnesklassifikation (UKÄ) – OBLIGATORISK

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TidskriftJournal of Physics G: Nuclear and Particle Physics
StatusPublished - 2008
Peer review utfördJa