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Onset of pi(0) suppression studied in Cu+Cu collisions at sqrt S NN=22.4, 62.4, and 200 GeV |
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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 Bai M Baksay G Baksay L Baldisseri A Barish K N Barnes P D Bassalleck B Basye A T Bathe S Batsouli S Baublis V Baumann C Bazilevsky A Belikov S Bennett R Berdnikov A Berdnikov Y Bickley A A Boissevain J G Borel H Boyle K Brooks M L Buesching H Bumazhnov V Bunce G Butsyk S Camacho C M Campbell S Chang B S Chang W C Charvet J-L Chernichenko S Chiba J Chi C Y Chiu M Choi I J Choudhury R K Chujo T Chung P Churyn A |
| Affiliation: | University of Colorado, Boulder, Colorado 80309, USA. |
| Abstract: | Neutral pion transverse momentum (p(T)) spectra at midrapidity (|y| less than or approximately 0.35) were measured in Cu+Cu collisions at sqrt[s(NN)]=22.4, 62.4, and 200 GeV. Relative to pi_(0) yields in p+p collisions scaled by the number of inelastic nucleon-nucleon collisions (N(coll) the pi_(0) yields for p(T) more than or approximately 2 GeV/c in central Cu+Cu collisions are suppressed at 62.4 and 200 GeV whereas an enhancement is observed at 22.4 GeV. A comparison with a jet-quenching model suggests that final state parton energy loss dominates in central Cu+Cu collisions at 62.4 and 200 GeV, while the enhancement at 22.4 GeV is consistent with nuclear modifications in the initial state alone. |
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