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Brookhaven National Laboratory, Upton, New York 11973-5000, USA.
Phys Rev Lett. 2006 Jan 27;96(3):032301. doi: 10.1103/PhysRevLett.96.032301. Epub 2006 Jan 26.
The PHENIX experiment has measured midrapidity ([FORMULA: SEE TEXT]) transverse momentum spectra ([FORMULA: SEE TEXT]) of electrons as a function of centrality in Au+Au collisions at [FORMULA: SEE TEXT]. Contributions from photon conversions and from light hadron decays, mainly Dalitz decays of pi0 and eta mesons, were removed. The resulting nonphotonic electron spectra are primarily due to the semileptonic decays of hadrons carrying heavy quarks. Nuclear modification factors were determined by comparison to nonphotonic electrons in p+p collisions. A significant suppression of electrons at high pT is observed in central Au+Au collisions, indicating substantial energy loss of heavy quarks.
PHENIX实验测量了在[公式：见文本]能量下金离子与金离子碰撞中，作为中心度函数的中快度（[公式：见文本]）电子横向动量谱（[公式：见文本]）。去除了光子转换以及轻强子衰变（主要是π0和η介子的达利兹衰变）的贡献。所得的非光子电子谱主要归因于携带重夸克的强子的半轻子衰变。通过与质子-质子碰撞中的非光子电子进行比较来确定核修正因子。在中心金离子与金离子碰撞中观察到高横动量下电子的显著抑制，这表明重夸克存在大量能量损失。
