Inclusive pi(0), eta, and direct photon production at high transverse momentum in p plus p and d 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
2010
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Resumo |
We report a measurement of high-p(T) inclusive pi(0), eta, and direct photon production in p + p and d + Au collisions at root s(NN) = 200 GeV at midrapidity (0 < eta < 1). Photons from the decay pi(0) -> gamma gamma were detected in the barrel electromagnetic calorimeter of the STAR experiment at the Relativistic Heavy Ion Collider. The eta -> gamma gamma decay was also observed and constituted the first eta measurement by STAR. The first direct photon cross-section measurement by STAR is also presented; the signal was extracted statistically by subtracting the pi(0), eta, and omega(782) decay background from the inclusive photon distribution observed in the calorimeter. The analysis is described in detail, and the results are found to be in good agreement with earlier measurements and with next-to-leading-order perturbative QCD calculations. RHIC Operations Group RCF at BNL NERSC Center at LBNL Open Science Grid consortium Offices of NP within the US DOE Office of Science HEP within the US DOE Office of Science US NSF National Science Foundation Sloan Foundation Deutsche Forschungsgemeinschaft - DFG[CNRS/IN2P3] 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 |
Identificador |
PHYSICAL REVIEW C, v.81, n.6, 2010 0556-2813 http://producao.usp.br/handle/BDPI/16299 10.1103/PhysRevC.81.064904 |
Idioma(s) |
eng |
Publicador |
AMER PHYSICAL SOC |
Relação |
Physical Review C |
Direitos |
restrictedAccess Copyright AMER PHYSICAL SOC |
Palavras-Chave | #BARREL ELECTROMAGNETIC CALORIMETER #TIME PROJECTION CHAMBER #HEAVY-ION COLLISIONS #LEADING ORDER #HADRON-PRODUCTION #D+AU COLLISIONS #STAR #PHYSICS #FRAGMENTATION #DISTRIBUTIONS #Physics, Nuclear |
Tipo |
article original article publishedVersion |