EPJ

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EPJ C - Particles and Fields
Particles and Fields
\n This email address is being protected from spambots. You need JavaScript enabled to view it. ), CBLU, University of Leeds * revised and updated by: Marcus Hennecke, Ross Moore, Herb Swan * with significant contributions from: Jens Lippmann, Marek Rouchal, Martin Wilck and others --> Eur. Phys. J. C 17, 179-186
DOI 10.1007/s100520000452

Determination of the equation of state of quark matter
from $J/\psi$ and $\Upsilon$ suppression at RHIC and LHC

D. Pal - B.K. Patra - D.K. Srivastava

Variable Energy Cyclotron Centre, 1/AF Bidhan Nagar, Calcutta 700 064, India

Received: 29 February 2000 / Revised version: 25 April 2000 /
Published online: 9 August 2000 - © Springer-Verlag 2000

Abstract
The long lifetime of the quark-gluon plasma likely to be created in relativistic heavy ion collisions at RHIC and LHC energies renders it sensitive to the details of the equation of state of the quark matter. We show that the pT dependence of the survival probability of the directly produced $J/\psi$ at RHIC energies and that of the directly produced $\Upsilon$ at LHC energies is quite sensitive to the speed of sound in the quark matter, which relates the pressure and the energy density of the plasma. The transverse expansion of the plasma is shown to strongly affect the $J/\psi$ suppression at LHC energies.

Copyright Società Italiana di Fisica, Springer-Verlag 2000

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