Neutral pion production in Au plus Au collisions at root s(NN)=200 GeV
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
18/04/2012
18/04/2012
2009
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Resumo |
The results of midrapidity (0 < y < 0.8) neutral pion spectra over an extended transverse momentum range (1 < p(T) < 12 GeV/c) in root s(NN) = 200 GeV Au + Au collisions, measured by the STAR experiment, are presented. The neutral pions are reconstructed from photons measured either by the STAR Barrel Electro-Magnetic Calorimeter or by the Time Projection Chamber via tracking of conversion electron-positron pairs. Our measurements are compared to previously published pi(+/-) and pi(0) results. The nuclear modification factors R(CP) and R(AA) of pi(0) are also presented as a function of p(T). In the most central Au + Au collisions, the binary collision scaled pi(0) yield at high p(T) is suppressed by a factor of about 5 compared to the expectation from the yield of p + p collisions. Such a large suppression is in agreement with previous observations for light quark mesons and is consistent with the scenario that partons suffer considerable energy loss in the dense medium formed in central nucleus-nucleus collisions at the Relativistic Heavy Ion Collider. US DOE U.S. NSF National Science Foundation Sloan Foundation Deutsche Forschungsgemeinschaft - DFG STFC EPSRC of the United Kingdom FAPESP CNPq of Brazil MES Ministry of Education and Science of the Russian Federation National Natural Science Foundation of China (NNSFC) CAS of China MoST of China MoE of China GACR Czech Republic FOM and NOW of the Netherlands (CSIR) Council of Scientific and Industrial Research - India Polish Ministry of Science and Higher Education Korea Research Foundation (KRF) Ministry of Science, Education and Sports of the Republic of Croatia MES Russian Ministry of Science and Technology Rosatom of Russia |
Identificador |
PHYSICAL REVIEW C, v.80, n.4, 2009 0556-2813 http://producao.usp.br/handle/BDPI/16316 10.1103/PhysRevC.80.044905 |
Idioma(s) |
eng |
Publicador |
AMER PHYSICAL SOC |
Relação |
Physical Review C |
Direitos |
restrictedAccess Copyright AMER PHYSICAL SOC |
Palavras-Chave | #TRANSVERSE-MOMENTUM DISTRIBUTIONS #NUCLEUS-NUCLEUS COLLISIONS #D+AU COLLISIONS #ENERGY-LOSS #COLLABORATION #SUPPRESSION #P+P #Physics, Nuclear |
Tipo |
article original article publishedVersion |