The Evolution of cross-section ratio psi-prime / J / psi from p A to S U interactions: Direct photon emission in correlation with Phi and J / psi - INSPIRE

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The Evolution of cross-section ratio psi-prime / J / psi from p A to S U interactions: Direct photon emission in correlation with Phi and J / psi

NA38

Collaboration

•

M.C. Abreu
(
- LIP, Lisbon
)

1995

Part of Quark matter '95. Proceedings, 11th International Conference on Ultrarelativistic Nucleus-Nucleus Collisions, Monterey, USA, January 9-13, 1995

Published in:

Nucl.Phys.A 590 (1995) 117C-126C

Contribution to:

11th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions (Quark Matter 95) (To be preceded by Workshop on Physics with RHIC and LHC Collider Detectors)

DOI:

10.1016/0375-9474(95)00230-X

Experiments:

CERN-NA-038

View in:

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Abstract: (Elsevier)

J ψ and ψ′ production cross sections are studied for several proton induced reactions and in SU collisions, in the NA38 experiment, by measuring the resonances' decays in the muon pair channel. Whereas in p-A interactions the ψ ′/ J / ψ ratio remains constantin going from p-p and p-d collisions to p-W and p-U, with a mean value of 1.76% ± 0.04%, in the SU data it exhibits half of this value and decreases as centrality of the collision increases. Also studied are the differences between the γ π 0 ratio yields correlated with the J ψ mass range and other dimuon masses; no significant effect is seen.

talk: Monterey 1995/01/09
p p: inelastic scattering
inelastic scattering: p p
p nucleus: nuclear reaction
nucleus nucleus: nuclear reaction
sulfur
uranium
muon: pair production
pair production: muon
mass spectrum: dimuon

References(14)

Figures(0)

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