Study of ψ\psi^\prime and χc\chi_c decays as feed-down sources of J/ψJ/\psi hadro-production

Aug, 2008
12 pages
Published in:
  • JHEP 10 (2008) 004
e-Print:

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Abstract: (arXiv)
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 pp 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.
  • J/psi(3100): yield
  • heavy ion: scattering
  • psi(3685): hadroproduction
  • p nucleus: inclusive reaction
  • p p: interaction
  • chi/c0(3415)
  • psi(3685): hadronic decay
  • chi/c0(3415): radiative decay
  • cross section
  • Brookhaven RHIC Coll