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Brookhaven National Laboratory, Upton, New York 11973-5000, USA.
Phys Rev Lett. 2003 Aug 15;91(7):072301. doi: 10.1103/PhysRevLett.91.072301. Epub 2003 Aug 13.
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.
在布鲁克海文国家实验室相对论重离子对撞机（BNL RHIC）的PHENIX实验中，测量了在质心能量(\sqrt{s_{NN}} = 200) GeV的金金碰撞中，横动量(1 < p_T < 10) GeV/c范围内中性π介子的横动量谱。中心反应中π⁰的多重数显著低于在相同(\sqrt{s_{NN}})下，通过核子 - 核子碰撞数进行标度的外围金金和质子 - 质子反应中测量的产额。对于最中心的区间，在(p_T = 2) GeV/c时抑制因子约为2.5，在(p_T \approx 4) GeV/c时增加到约4 - 5。在更大的(p_T)时，在误差范围内抑制保持恒定。这种亏损在半外围反应中已经很明显，并随着中心度的增加而平滑增加。
