Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 10, Pages -Publisher
SPRINGER
DOI: 10.1088/1126-6708/2008/10/004
Keywords
Heavy Ions
Categories
Funding
- Fundacao para a Ciencia e a Tecnologia, Portugal [SFRH/BPD/42343/2007, SFRH/BPD/42138/2007, CERN/FP/83516/2008]
- Fundação para a Ciência e a Tecnologia [SFRH/BPD/42138/2007, SFRH/BPD/42343/2007, CERN/FP/83516/2008] Funding Source: FCT
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The interpretation of the J/psi suppression patterns observed in nuclear collisions, at CERN and RHIC, as a signature of the formation of a deconfined phase of QCD matter, requires knowing which fractions of the measured J/psi yields, in elementary collisions, are due to decays of heavier charmonium states. From a detailed analysis of the available mid-rapidity charmonium hadro-production cross sections, or their ratios, we determine that the J/psi feed-down contributions from psi' and chi(c) decays are, respectively, (8.1 +/- 0.3)% and (25 +/- 5)%. These proton-proton values are derived from global averages of the proton-nucleus measurements, assuming that the charmonium states are exponentially absorbed with the length of matter they traverse in the nuclear targets.
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