Study of $\psi^\prime$ and $\chi_c$ decays as feed-down sources of $J/\psi$ hadro-production - INSPIRE

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

P. Faccioli
(
- LIP, Lisbon
)
,
C. Lourenco
(
- CERN
)
,
J. Seixas
(
- LIP, Lisbon and
- Lisbon, IST and
- Lisbon, CFTP
)
,
H.K. Woehri
(
- LIP, Lisbon
)

Aug, 2008

12 pages

Published in:

JHEP 10 (2008) 004

e-Print:

0809.2153 [hep-ph]

DOI:

10.1088/1126-6708/2008/10/004

View in:

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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

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