Measurement of an Excited Charmonium State and the Study of Polarization in Collisions at in PHENIX Experiment at RHIC

✍ Scribed by Marisilvia Donadelli

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 310 KB
• Volume: 827
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/j.nuclphysa.2009.05.099

✦ Synopsis

We report the J/ψ → e + eand the ψ → e + e -production cross sections in the PHENIX experiment at RHIC. The first measurements of the production cross sections of the ψ and the ψ over the J/ψ, will contribute to the clarification of the theoretical understanding of the J/ψ meson production. The inclusive J/ψ polarization through the same decay channel is also presented, showing a trend of slightly longitudinal polarization for p T <5 GeV/c.