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J/$\psi$ production in Indium-Indium collisions at 158 GeV/nucleon

Abstract : The NA60 experiment studies muon pair production at the CERN SPS. In this letter we report on a precision measurement of J/psi in In-In collisions. We have studied the J/psi centrality distribution, and we have compared it with the one expected if absorption in cold nuclear matter were the only active suppression mechanism. For collisions involving more than ~80 participant nucleons, we find that an extra suppression is present. This result is in qualitative agreement with previous Pb-Pb measurements by the NA50 experiment, but no theoretical explanation is presently able to coherently describe both results.
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Contributor : Sylvie Flores <>
Submitted on : Wednesday, October 3, 2007 - 11:10:07 AM
Last modification on : Tuesday, April 20, 2021 - 12:00:12 PM

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R. Arnaldi, K. Banicz, B. Chaurand, C. Cicalò, A. Colla, et al.. J/$\psi$ production in Indium-Indium collisions at 158 GeV/nucleon. Physical Review Letters, American Physical Society, 2007, 99, pp.132302. ⟨10.1103/PhysRevLett.99.132302⟩. ⟨in2p3-00176311⟩



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