Suppressed pi(0) production at large transverse momentum in central Au+Au collisions at sqrt[s(NN)]=200 GeV.
Suppressed pi(0) production at large transverse momentum in central Au+Au collisions at sqrt[s(NN)]=200 GeV.
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DOI：
10.1103/physrevlett.91.072301
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发表时间：
2003-04
影响因子：
8.6
通讯作者：
Phenix Collaboration;S. Adler;E. al.
中科院分区：
文献类型：
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作者：
Phenix Collaboration;S. Adler;E. al.
用北京正负电子对撞机上的PHENIX实验在Sqrt[S(NN)]=200GeV的Au+Au碰撞中测量了1<；p(T)<；10GeV/c范围内中性介子的横向动量谱。中心反应的pi(0)多重数显著低于周边Au+Au和p+p反应在相同Sqrt[S(NN)]下按核子-核子碰撞次数测量的产额。对于最中心的面元，当p(T)=2GeV/c时，抑制因子约为2.5，在p(T)约为4GeV/c时，抑制因子增加到约4-5。在较大的p(T)时，抑制在误差范围内保持恒定。这种缺陷在半周性反应中已经很明显，并随着中心性的增加而平稳增加。
Transverse momentum spectra of neutral pions in the range 1<p(T)<10 GeV/c have been measured at midrapidity by the PHENIX experiment at BNL RHIC in Au+Au collisions at sqrt[s(NN)]=200 GeV. The pi(0) multiplicity in central reactions is significantly below the yields measured at the same sqrt[s(NN)] in peripheral Au+Au and p+p reactions scaled by the number of nucleon-nucleon collisions. For the most central bin, the suppression factor is approximately 2.5 at p(T)=2 GeV/c and increases to approximately 4-5 at p(T) approximately 4 GeV/c. At larger p(T), the suppression remains constant within errors. The deficit is already apparent in semiperipheral reactions and increases smoothly with centrality.