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arXiv 1910.01686hep-ex
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$\sqrt{s} =$ 8 TeV pp碰撞喷注内J/ $ψ$介子产生的研究

Study of J/$ψ$ meson production inside jets in pp collisions at $\sqrt{s} =$ 8 TeV

CMS Collaboration

备注：
Replaced with the published version. Added the journal reference. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/BPH-15-003 (CMS Public Pages)
发表信息：
Phys. Lett. B 804 (2020) 135409
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摘要：

本文研究了在$\sqrt{s} =$ 8 TeV质子-质子碰撞喷注中产生的瞬发J/ $ψ$介子。该分析是基于在大型强子对撞机上用CMS探测器收集的积分亮度为19.1 fb $^{-1}$的数据。对于至少观测到一个喷流的事件，J/ $ψ$介子与喷流之间的角距用于测试J/ $ψ$介子是否是喷流的一部分。分析表明，能量大于15 GeV、快度$|y|<$为1的瞬发J/ $ψ$介子大多包含在赝快度为$|η_{\text{jet}}|$ $<$ 1的喷流中.的微分分布的概率有一个J/ $ψ$介子包含在射流作为一个函数的射流能量为一个固定的J/ $ψ$能量分数进行了比较的理论模型，使用破碎射流功能的方法。的数据同意最好的碎片射流函数计算，使用长距离矩阵元参数设置，其中提示J/ $ψ$介子被预测为非极化。这种技术展示了一种新的方法来测试预测提示J/ $ψ$生产使用非相对论量子色动力学。

英文摘要：

A study of the production of prompt J/$ψ$ mesons contained in jets in proton-proton collisions at $\sqrt{s} =$ 8 TeV is presented. The analysis is based on data corresponding to an integrated luminosity of 19.1 fb$^{-1}$ collected with the CMS detector at the LHC. For events with at least one observed jet, the angular separation between the J/$ψ$ meson and the jet is used to test whether the J/$ψ$ meson is part of the jet. The analysis shows that most prompt J/$ψ$ mesons with energy above 15 GeV and rapidity $|y|<$ 1 are contained in jets with pseudorapidity $|η_{\text{jet}}|$ $<$ 1. The differential distributions of the probability to have a J/$ψ$ meson contained in a jet as a function of jet energy for a fixed J/$ψ$ energy fraction are compared to a theoretical model using the fragmenting jet function approach. The data agree best with fragmenting jet function calculations that use a long-distance matrix element parameter set in which prompt J/$ψ$ mesons are predicted to be unpolarized. This technique demonstrates a new way to test predictions for prompt J/$ψ$ production using nonrelativistic quantum chromodynamics.

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