Medium modification of jet shapes and jet multiplicities.
Medium modification of jet shapes and jet multiplicities.
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DOI：
10.1103/physrevlett.93.042301
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发表时间：
2003-10
影响因子：
8.6
通讯作者：
C. Salgado;U. Wiedemann
中科院分区：
文献类型：
--
作者：
C. Salgado;U. Wiedemann
在相对论重离子对撞机（RHIC）上，介质诱导的部分子能量损失被广泛认为是导致sNN = 200 GeV Au+Au碰撞中高Pt主导强子谱被抑制的原因.它的描述意味着与硬部分子相关的次级强子碎片的特征性KT加宽。然而，后一种影响更难以衡量，迄今为止仍然难以捉摸。在这里，我们讨论它如何影响真正的喷流观测，这是在大型强子对撞机和RHIC可能访问。我们发现，喷注多重数分布的kt加宽提供了一个非常灵敏的探测致密QCD物质性质的探针，而喷注能量分布的灵敏度要弱得多。特别是，急流多重数分布的敏感运动范围几乎不受高多重数背景的影响。
Medium-induced parton energy loss is widely considered to underlie the suppression of high-pt leading hadron spectra in square root sNN = 200 GeV Au+Au collisions at the Relativistic Heavy Ion Collider (RHIC). Its description implies a characteristic kt broadening of the subleading hadronic fragments associated with the hard parton. However, this latter effect is more difficult to measure and has remained elusive so far. Here, we discuss how it affects genuine jet observables, which are accessible at the Large Hadron Collider and possibly at RHIC. We find that the kt broadening of jet multiplicity distributions provides a very sensitive probe of the properties of dense QCD matter, whereas the sensitivity of jet energy distributions is much weaker. In particular, the sensitive kinematic range of jet multiplicity distributions is almost unaffected by the high multiplicity background.