Jet-associated deuteron production in pp collisions at s=13 TeV
Jet-associated deuteron production in pp collisions at s=13 TeV
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DOI：
10.1016/j.physletb.2021.136440
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发表时间：
2020-11
影响因子：
4.4
通讯作者：
Alice Collaboration
中科院分区：
文献类型：
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作者：
Alice Collaboration
高能碰撞中氘核的产生对碰撞系统的时空演化敏感，通常用聚结机制来描述。我们首次提出了 s= 13 TeV 的 pp 碰撞中与射流相关的氘核产生的结果，为测试硬散射事件中氘核产生的既定图像提供了机会。使用具有高横向动量（p T> 5 GeV/c）的触发粒子作为中速射流存在的代理，我们观察到在射流代理周围产生可测量的氘核群体。在触发粒子周围的狭窄角度范围内测量的相关氘核产额与不相关背景相差 2.4–4.8 个标准差。这些数据由具有重子聚结特征的 PYTHIA 模型计算来描述。
Deuteron production in high-energy collisions is sensitive to the space–time evolution of the collision system, and is typically described by a coalescence mechanism. For the first time, we present results on jet-associated deuteron production in pp collisions at s= 13 TeV, providing an opportunity to test the established picture for deuteron production in events with a hard scattering. Using a trigger particle with high transverse-momentum (p T> 5 GeV/c) as a proxy for the presence of a jet at midrapidity, we observe a measurable population of deuterons being produced around the jet proxy. The associated deuteron yield measured in a narrow angular range around the trigger particle differs by 2.4–4.8 standard deviations from the uncorrelated background. The data are described by PYTHIA model calculations featuring baryon coalescence.