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arXiv 1107.2040nucl-ex
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Au+Au和p+p碰撞中重味衰变电子与强子的关联

Correlations of Electrons from Heavy Flavor Decay with Hadrons in Au+Au and p+p Collisions

Anne M. Sickles

摘要:

从开重味介子衰变的电子的测量表明,在Au+Au碰撞的产量被抑制相比,从二进制标度的p+p碰撞的预期。这些测量表明,粲夸克和底夸克与重离子碰撞产生的热密物质的相互作用比预期的要大得多。在这里,我们将这些研究扩展到两个粒子的相关性,其中一个粒子是一个电子的衰变的重味介子和其他的是一个带电的强子的衰变的重介子或从喷流碎裂。这些测量提供了关于重夸克和物质之间相互作用的更详细的信息,例如当触发粒子来自重介子衰变时,强子-强子关联中所见的远离侧喷流形状的修改是否存在,以及远离侧喷流抑制的总体水平是否一致。我们统计减去电子的相关性所产生的背景源的电子从包容性的电子-强子的相关性,并获得在$\sqrt{s_{NN}}$ =200 GeV的电子之间的重味衰变与带电强子在p+p,也是第一个结果在Au+Au碰撞的两粒子方位角相关。我们发现远离侧喷流的形状和产量进行修改,在Au+Au碰撞相比,p+p碰撞。

英文摘要:

Measurements of electrons from the decay of open-heavy flavor mesons have shown that the yields are suppressed in Au+Au collisions compared to expectations from binary-scaled p+p collisions. These measurements indicate that charm and bottom quarks interact with the hot-dense matter produced in heavy-ion collisions much more than expected. Here we extend these studies to two-particle correlations where one particle is an electron from the decay of a heavy-flavor meson and the other is a charged hadron from either the decay of the heavy meson or from jet fragmentation. These measurements provide more detailed information about the interactions between heavy quarks and the matter, such as whether the modifcation of the away-side-jet shape seen in hadron-hadron correlations is present when the trigger particle is from heavy-meson decay and whether the overall level of away-side-jet suppression is consistent. We statistically subtract correlations of electrons arising from background sources from the inclusive electron-hadron correlations and obtain two-particle azimuthal correlations at $\sqrt{s_{NN}}$ =200 GeV between electrons from heavy-flavor decay with charged hadrons in p+p and also first results in Au+Au collisions. We find the away-side-jet shape and yield to be modified in Au+Au collisions compared to p+p collisions.

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