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arXiv 2008.07430hep-phhep-ex
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在$J/ψ$对不变质谱中产生全粲结构

Producing fully-charm structures in the $J/ψ$-pair invariant mass spectrum

Jun-Zhang Wang, Dian-Yong Chen, Xiang Liu, Takayuki Matsuki

摘要:

最近,LHCb协作组报告了在6.2和7.4 GeV之间观测到$J/ψ$对不变质谱的几个增强。在这项工作中,我们提出的动力学机制,以模拟实验数据的一个双$J/ψ$质谱LHCb,这是基于反应,其中所有可能的组合的双粲偶素直接产生的质子-质子碰撞转移到一个最终状态$J/ψJ/ψ$。我们发现LHCb的实验数据可以很好地再现。我们进一步将我们的框架扩展到研究双$Υ(1S)$系统,给出了$b\bar{b}$系统中伙伴过程的微分截面在$Υ(1S)Υ(1S)$不变质量上的线形,表明在$m_{Υ(1S)Υ(1S)}=$ 19.0,19.3,19.7 GeV附近,在$Υ(1S)$对不变质量谱中应该存在可能的增强.这些预测可以在LHCb和CMS中进行测试,这可以在不久的将来作为一个潜在的研究问题。

英文摘要:

Very recently, the LHCb Collaboration reported the observation of several enhancements in the invariant mass spectrum of a $J/ψ$ pair between 6.2 and 7.4 GeV. In this work, we propose the dynamical mechanism to mimic the experimental data of a di-$J/ψ$ mass spectrum given by LHCb, which is based on the reactions, where all the possible combinations of a double charmonium directly produced by a proton-proton collision are transferred into a final state $J/ψJ/ψ$. We find that the LHCb experimental data can be well reproduced. We further extend our framework to study a di-$Υ(1S)$ system, and give the line shape of a differential cross section of a partner process in a $b\bar{b}$ system on the invariant mass of $Υ(1S)Υ(1S)$, which shows that there should exist possible enhancements near $m_{Υ(1S)Υ(1S)}=$19.0, 19.3, 19.7 GeV in the $Υ(1S)$-pair invariant mass spectrum. These predictions can be tested in LHCb and CMS, which can be as a potential research issue in near future.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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