Psi prime to J/psi Ratio Measurements in PHENIX at RHIC

Abstract

The ratio of the ${\psi }^{\prime }$ over the $J/\psi$ production cross section in the dielectron channel has been measured in $\sqrt{s}=$ 200 GeV $p+p$ collisions with the PHENIX detector at RHIC. The analysis is based on fitting of the dielectron invariant mass spectra in the area around the $J/\psi$ and ${\psi }^{\prime }$ signals in order to extract a ratio ${\psi }^{\prime }$ over $J/\psi$ of 0.019$\pm 0.005($stat$)\pm 0.002($sys$)$ and a fractional feed-down contribution to $J/\psi$ from ${\psi }^{\prime }$ of $8.6\pm 2.5$.

4 pages, 7 figures submitted to: Indian Journal of Physics (2010) - Proceedings of the 20th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions (QM2008)

References in corpus (2)

• Hard probes in nucleus-nucleus collisions
• A Measurement of the Psi' to J/psi Production Ratio in 920 GeV Proton-Nucleus Interactions