J/ψ production in sNN=200GeV Cu+Cu collisions
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Date
2008-09-18Author
Adare, Andrew Marshall
Afanasiev, Sergey V.
Aidala, Christine A.
Ajitanand, N. N.
Akiba, Yasuyuki
Baksay, Gyöngyi
Baksay, László A.
Hohlmann, Marcus
Rembeczki, S.
Dehmelt, K.
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Show full item recordAbstract
Yields for J=c production in Cu þ Cu collisions at ffiffiffiffiffiffiffiffi
sNN p ¼ 200 GeV have been measured over the
rapidity range jyj < 2:2 and compared with results in p þ p and Au þ Au collisions at the same energy.
The Cu þ Cu data offer greatly improved precision over existing Au þ Au data for J=c 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 þ Au data
describe the Cu þ Cu data up to Npart 50, corresponding to a Bjorken energy density of at least
1:5 GeV=fm3.