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J/psi production in sqrt s_NN=200 GeV Cu+Cu collisions |
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| Authors: | Adare A Afanasiev S Aidala C Ajitanand N N Akiba Y Al-Bataineh H Alexander J Aoki K Aphecetche L Armendariz R Aronson S H Asai J Atomssa E T Averbeck R Awes T C Azmoun B Babintsev V Baksay G Baksay L Baldisseri A Barish K N Barnes P D Bassalleck B Bathe S Batsouli S Baublis V Bazilevsky A Belikov S Bennett R Berdnikov Y Bickley A A Boissevain J G Borel H Boyle K Brooks M L Buesching H Bumazhnov V Bunce G Butsyk S Campbell S Chang B S Charvet J-L Chernichenko S Chiba J Chi C Y Chiu M Choi I J Chujo T Chung P Churyn A Cianciolo V Cleven C R Cole B A Comets M P Constantin P Csanád M Csörgo T |
| Institution: | University of Colorado, Boulder, Colorado 80309, USA. |
| Abstract: | Yields for J/psi production in Cu+Cu collisions at sqrt 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 approximately 50, corresponding to a Bjorken energy density of at least 1.5 GeV/fm(3). |
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