流与融合解释强子核修正和高-$p_T$各向异性
Flow plus coalescence explain hadron nuclear modification and high-$p_T$ anisotropy
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中文总结 AI 辅助
本文提出高$p_T$下硬部分子与热介质部分子融合的机制，解释$p$Pb碰撞中核修正因子为1而椭圆流为正的现象，并与实验定性一致。
中文摘要 AI 辅助
长期以来，相对论性$p$Pb碰撞中的核修正因子与1一致，而高-$p_T$椭圆流显著为正，这一直是个谜。后者传统上被解释为依赖于路径长度的能量损失，而前者则与零能量损失一致。在本信中，我们提出即使在高$p_T$下，硬部分子也会与一个增强的热介质部分子融合，该部分子的能量与角度依赖的径向流相关。我们比较了$pp$、$p$Pb、$p$O、OO和PbPb碰撞系统中的这种流，并特别得出结论：$p$Pb流大且各向异性。集体介质将硬部分子推出，在$p$Pb或面内碰撞中比在$pp$或面外碰撞中更明显。该机制与实验定性一致，并预测喷注的椭圆流信号显著小于强子。
英文摘要
It has long been a puzzle why the nuclear modification factor in relativistic $p$Pb collisions is consistent with unity, while the high-$p_T$ elliptic flow is significantly positive. The latter is traditionally interpreted as path-length-dependent energy loss, whereas the former is consistent with zero energy loss. In this Letter, we propose that even at high $p_T$ a hard parton coalesces with a boosted thermal medium parton whose energy is correlated with the angle-dependent radial flow. We compare this flow for $pp$, $p$Pb, $p$O, OO and PbPb collision systems and conclude in particular that the $p$Pb flow is large and anisotropic. The collective medium pushes out the hard partons, and more so in $p$Pb, or in-plane, than in $pp$ collisions, or out-of-plane. The mechanism qualitatively agrees with experiment and predicts a significantly smaller elliptic flow signal for jets than for hadrons.
发表机构
- CERN（欧洲核子研究中心）
- Utrecht University（乌得勒支大学）
- NIKHEF（荷兰国家核物理与粒子物理研究所）
- University of the Witwatersrand（威特沃特斯兰德大学）
- National Institute for Theoretical and Computational Sciences（理论与计算科学国家研究所）
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