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University of Colorado, Boulder, Colorado 80309, USA.
Phys Rev Lett. 2006 Dec 22;97(25):252002. doi: 10.1103/PhysRevLett.97.252002. Epub 2006 Dec 21.
The momentum distribution of electrons from decays of heavy flavor (charm and bottom) for midrapidity absolute value of y < 0.35 in p + p collisions at square root of s = 200 GeV has been measured by the PHENIX experiment at the BNL Relativistic Heavy Ion Collider over the transverse momentum range 0.3 < pT < 9 GeV/c. Two independent methods have been used to determine the heavy-flavor yields, and the results are in good agreement with each other. A fixed-order-plus-next-to-leading-log perturbative QCD calculation agrees with the data within the theoretical and experimental uncertainties, with the data/theory ratio of 1.71+/-0.02stat+/-0.18sys for 0.3 < pT < 9 GeV/c. The total charm production cross section at this energy has also been deduced to be sigma cc = 567+/-57stat+/-193sys microb.
在布鲁克海文国家实验室相对论重离子对撞机（BNL Relativistic Heavy Ion Collider）上，PHENIX实验测量了在质心能量(\sqrt{s}=200) GeV的(p + p)碰撞中，快度绝对值(|y| < 0.35)时重味（粲夸克和底夸克）衰变产生的电子的动量分布，横向动量范围为(0.3 < p_T < 9) GeV/c。使用了两种独立方法来确定重味产额，结果彼此吻合良好。固定阶加次领头对数微扰量子色动力学计算在理论和实验不确定性范围内与数据相符，对于(0.3 < p_T < 9) GeV/c，数据与理论的比值为(1.71\pm0.02_{统计}\pm0.18_{系统})。在此能量下，粲夸克产生的总截面也被推导为(\sigma_{cc}=567\pm57_{统计}\pm193_{系统})微靶恩。
