Medium modification of γ jets in high-energy heavy-ion collisions.
Medium modification of γ jets in high-energy heavy-ion collisions.
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DOI：
10.1103/physrevlett.111.062301
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发表时间：
2013-02
影响因子：
8.6
通讯作者：
Xin-Nian Wang;Yan Zhu
中科院分区：
文献类型：
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作者：
Xin-Nian Wang;Yan Zhu
在大型强子对撞机中心铅+铅碰撞中喷流猝灭实验研究中的两个令人困惑的特征可以在喷流传播的线性玻尔兹曼输运模型中得到解释。实验发现，由于介质的快速冷却，γ标记射流的初始能量损失约15%，而其方位角几乎保持不变。重建喷流碎裂函数被发现有一些适度的增强，在小和大的分数动量相比，在真空中，因为增加的领先粒子的贡献，重建喷流能量和诱导胶子辐射和反冲部分子。提出了一种对射流-介质相互作用和介质中射流输运参数更为敏感的γ标记射流破碎函数。还讨论了反冲介质部分子对重构喷注的影响。
Two puzzling features in the experimental study of jet quenching in central Pb+Pb collisions at the LHC are explained within a linearized Boltzmann transport model for jet propagation. A γ-tagged jet is found to lose about 15% of its initial energy while its azimuthal angle remains almost unchanged due to rapid cooling of the medium. The reconstructed jet fragmentation function is found to have some modest enhancement at both small and large fractional momenta as compared to that in the vacuum because of the increased contribution of leading particles to the reconstructed jet energy and induced gluon radiation and recoiled partons. A γ-tagged jet fragmentation function is proposed that is more sensitive to jet-medium interaction and the jet transport parameter in the medium. The effects of recoiled medium partons on the reconstructed jets are also discussed.