Journal
PHYSICAL REVIEW LETTERS
Volume 101, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.101.122301
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Funding
- Office of Nuclear Physics in DOE Office of Science
- NSF (U.S.)
- MEXT
- JSPS (Japan)
- CNPq
- FAPESP (Brazil)
- NSFC (China)
- MSMT (Czech Republic)
- IN2P3/CNRS
- CEA (France)
- BMBF
- DAAD
- AvH (Germany)
- OTKA (Hungary)
- DAE (India)
- ISF (Israel)
- KRF
- KOSEF (Korea)
- MES
- RAS
- FAAE (Russia)
- VR
- KAW (Sweden)
- U.S. CRDF
- USHungarian NSF-OTKA-MTA
- US-Israel BSF
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Yields for J/psi production in Cu+Cu collisions at root s(NN) = 200 GeV have been measured over the rapidity range |y|< 2.2 and compared with results in p+p and Au+Au collisions at the same energy. The Cu+Cu data offer greatly improved precision over existing Au+Au data for J/psi production in collisions with small to intermediate numbers of participants, in the range where the quark-gluon plasma transition threshold is predicted to lie. Cold nuclear matter estimates based on ad hoc fits to d+Au data describe the Cu+Cu data up to N-part similar to 50, corresponding to a Bjorken energy density of at least 1.5 GeV/fm(3).
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