Abstract
The ratio of the ψ′ over the J ψ 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 ψ and ψ′ signals in order to extract a ratio ψ′ over J ψ of 0.019 ± 0.005 (stat) ± 0.002 (sys) and a fractional feed-down contribution to J ψ from ψ′ of 8.6 ± 2.5%.
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Donadelli, M. ψ′ to J/ψ ratio measurements in PHENIX at RHIC. Indian J Phys 85, 27–32 (2011). https://doi.org/10.1007/s12648-011-0013-y
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DOI: https://doi.org/10.1007/s12648-011-0013-y