Onset of pi(0) Suppression Studied in Cu plus Cu Collisions at root s(NN)=22.4, 62.4, and 200 GeV
| Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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| Data(s) |
18/04/2012
18/04/2012
2008
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| Resumo |
Neutral pion transverse momentum (p(T)) spectra at midrapidity (|y| less than or similar to 0.35) were measured in Cu + Cu collisions at root 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) greater than or similar to 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. Office of Nuclear Physics in DOE Office of Science National Science Foundation NSF Renaissance Technologies (U. S.) MEXT and JSPS (Japan) CNPq and FAPESP (Brazil) NSFC (China) MSMT (Czech Republic) Centre National de la Recherche Scientifique - IN2P3/CNRS CEA (France) BMBF - Bundesministerium fur Bildung und Forschung, Germany (DAAD) Deutscher Akademischer Austausch Dienst, Germany Alexander von Humboldt Foundation (Germany) OTKA (Hungary) (DAE) Department of Atomic Energy, India ISF - Israel Science Foundation (Israel) KRF KOSEF (Korea) MES Ministry of Education and Science of the Russian Federation RAS Russia Academy of Sciences FAAE (Russia) VR (Sweden) KAW (Sweden) U. S. CRDF for the FSU U. S.-Hungary Fulbright (BSF) US-Israel Binational Science Foundation |
| Identificador |
PHYSICAL REVIEW LETTERS, v.101, n.16, 2008 0031-9007 http://producao.usp.br/handle/BDPI/16108 10.1103/PhysRevLett.101.162301 |
| Idioma(s) |
eng |
| Publicador |
AMER PHYSICAL SOC |
| Relação |
Physical Review Letters |
| Direitos |
restrictedAccess Copyright AMER PHYSICAL SOC |
| Palavras-Chave | #NUCLEUS COLLISIONS #TRANSVERSE-MOMENTUM #ENERGY-LOSS #SPECTRA #MATTER #Physics, Multidisciplinary |
| Tipo |
article original article publishedVersion |