We study the effect of energy loss on charm and bottom quarks in high-energyheavy-ion collisions including longitudinal expansion and partialthermalization. We find that high $p_\perp$ heavy quarks are greatlysuppressed, and consequently, high-mass dileptons from heavy quark decays arealso suppressed. We consider in detail the detector geometry and single leptonenergy cuts of the PHENIX detector at the Relativistic Heavy Ion Collider(RHIC). Because of the longitudinal expansion, the suppressions of $ee, e\mu$and $\mu\mu$ pairs resulting from the heavy quark energy loss are verydifferent due to the different rapidity coverages and energy cuts. The assumedenergy loss rate, on the order of 1 GeV/fm, results in a large suppression ondielectrons, and dielectrons from heavy quark decays become comparable or evenlower than the Drell-Yan yield. It is thus possible to probe the energy lossrate of the medium using dileptons from heavy quark decays.
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机译：我们研究了能量损失对高能重离子碰撞（包括纵向膨胀和部分热化）中的魅力和底部夸克的影响。我们发现高$ p_ \ perp $重夸克被大大抑制，因此，重夸克衰变产生的高质量二轻子也被抑制。我们详细考虑了相对论重离子对撞机（RHIC）上PHENIX检测器的检测器几何形状和单个轻子能量削减。由于纵向膨胀，夸克能量损失较大，对$ ee，e \ mu和$ \ mu \ mu $对的抑制因不同的快速覆盖率和能量削减而非常不同。假定的能量损失率大约为1 GeV / fm，导致对双电子的抑制作用很大，并且夸克衰变导致的双电子变得与Drell-Yan产量相当甚至更低。因此，可以使用夸克衰变严重时产生的二酮来探测介质的能量损失率。
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