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The dependence of the anomalous $J/\psi$ suppression on the number of participant nucleons

Abstract : The observation of an anomalous \jpsi\ suppression in \mbox{Pb-Pb} collisions by the NA50 collaboration can be considered as the most striking indication for the deconfinement of quarks and gluons at SPS energies. In this letter, we determine the \jpsi\ suppression pattern as a function of the forward hadronic energy \ezdc\ measured in a Zero Degree Calorimeter (ZDC). The direct connection between \ezdc\ and the geometry of the collision allows us to calculate, within a Glauber approach, the precise relation between the number of participant nucleons \npart\ and \ezdc. Then, we check if the experimental data can be better explained by a sudden or a smooth onset of the anomalous \jpsi\ suppression as a function of the number of participants.
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http://hal.in2p3.fr/in2p3-00010537
Contributor : Sylvie Flores <>
Submitted on : Tuesday, December 4, 2001 - 8:45:15 AM
Last modification on : Tuesday, April 20, 2021 - 12:00:09 PM
Long-term archiving on: : Tuesday, June 2, 2015 - 12:12:05 PM

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  • HAL Id : in2p3-00010537, version 1

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M C. Abreu, B. Alessandro, C. Alexa, R. Arnaldi, M. Atayan, et al.. The dependence of the anomalous $J/\psi$ suppression on the number of participant nucleons. Physics Letters B, Elsevier, 2001, 521, pp.195-203. ⟨in2p3-00010537⟩

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