Abstract
The NA60 experiment studies muon pair production at the CERN Super Proton Synchrotron. In this Letter we report on a precision measurement of J/ψ in In-In collisions. We have studied the J/ψ 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.
Original language | English |
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Article number | 132302 |
Journal | Physical review letters |
Volume | 99 |
Issue number | 13 |
DOIs | |
Publication status | Published - 2007 Sep 26 |
Externally published | Yes |
ASJC Scopus subject areas
- Physics and Astronomy(all)