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

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

2010-04-16

arxiv.org/abs/1004.2864v1

Physics

Nuclear Physics

Nuclear Experiment

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

Scientific paper

The ratio of the $\psi'$ 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 $\psi'$ signals in order to extract a ratio $\psi'$ 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 $8.6 \pm 2.5 %$.

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