arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1709.06358hep-phhep-exnucl-exnucl-th
收藏

多部分子相互作用在LHC能$p+p$碰撞中产生$J/ψ$中的作用

Role of Multi-Parton Interactions on $J/ψ$ production in $p+p$ collisions at LHC Energies

Dhananjaya Thakur, Sudipan De, Raghunath Sahoo, Soumya Dansana

备注：
Version accepted for publication in Physical Rev. D
发表信息：
Phys. Rev. D 97, 094002 (2018)
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

强子碰撞中夸克偶素态的产生机制仍有待科学界的理解。在高多重性$p+p$碰撞中，基础事件（UE）观测量是主要的兴趣。多部分子相互作用（MPI）是UE可观察的，其中在单个$p+p$事件中在部分子水平上发生若干相互作用。这导致粒子产生对事件多重性的依赖。如果MPI发生在更硬的尺度上，夸克偶素的产额和总的带电粒子多重数之间将存在相关性。在大型强子对撞机（LHC）上进行的7和13TeV的$\sqrt{s}$碰撞ALICE实验中，观测到相对$J/ψ$产额（$\frac{dN_{J/ψ}/dy}{<dN_{J/ψ}/dy>}$）与相对带电粒子多重数密度（$\frac{dN_{ch}/dy}{<dN_{ch}/dy>}$）近似线性增加.在我们目前的工作中，我们已经进行了全面的研究，在$p+p$碰撞在LHC能量的带电粒子多重性的函数的charmonia的生产使用pQCD启发的多部分子相互作用模型，PYTHIA 8调4C，有和没有颜色重连（CR）计划。进行详细的多重性和能量依赖性研究以了解MPI对$J/ψ$产生的影响。还研究了$ψ(2S)$与$J/ψ$的比值随LHC能量下带电粒子多重性的变化。

英文摘要：

The production mechanism of quarkonia states in hadronic collisions is still to be understood by the scientific community. In high-multiplicity $p+p$ collisions, Underlying Event (UE) observables are of major interest. The Multi-Parton Interactions (MPI) is a UE observable, where several interactions occur at the partonic level in a single $p+p$ event. This leads to dependence of particle production on event multiplicity. If the MPI occurs in a harder scale, there will be a correlation between the yield of quarkonia and total charged particle multiplicity. The ALICE experiment at the Large Hadron Collider (LHC) in $p+p$ collisions at $\sqrt{s}$ = 7 and 13 TeV has observed an approximate linear increase of relative $J/ψ$ yield ($\frac{dN_{J/ψ}/dy}{<dN_{J/ψ}/dy>}$) with relative charged particle multiplicity density ($\frac{dN_{ch}/dy}{<dN_{ch}/dy>}$). In our present work we have performed a comprehensive study of the production of charmonia as a function of charged particle multiplicity in $p+p$ collisions at LHC energies using pQCD-inspired multiparton interaction model, PYTHIA8 tune 4C, with and without Color Reconnection (CR) scheme. A detail multiplicity and energy dependent study is performed to understand the effects of MPI on $J/ψ$ production. The ratio of $ψ(2S)$ to $J/ψ$ is also studied as a function of charged particle multiplicity at LHC energies.

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。

↑