2008/06/30 by Catherine Silvestre · 1 citation
Physics and Astronomy · #Bar (unit) #Coalescence (physics) #Elliptic flow #High-Energy Particle Collisions Research #Large Hadron Collider #Meson #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Production (economics) #Quantum Chromodynamics and Particle Interactions #Rapidity #nucl-ex
paper · pdf · doi:10.1088/0954-3899/35/10/104136
published as J.Phys.G35:104136,2008 · 4 pages, 3 figures, Quark Matter 2008 proceedings
arxiv created 2008/07/17 · openalex publication_date 2008/09/17 · openalex created_date 2019/06/27 · arxiv updated 2019/08/13 · openalex updated_date 2026/08/05
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.