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arXiv 2005.11123nucl-exhep-ex
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$\sqrt{s}$ = 13 TeV pp碰撞中中快度J/ $ψ$产生的多重数关系

Multiplicity dependence of J/$ψ$ production at midrapidity in pp collisions at $\sqrt{s}$ = 13 TeV

ALICE Collaboration

备注：
22 pages, 7 captioned figures, 2 tables, authors from page 17, published version, figures at http://alice-publications.web.cern.ch/node/6220
发表信息：
Phys. Lett. B 810 (2020) 135758
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摘要：

本文报道了在LHC上用ALICE测量了在$\sqrt{s}$ = 13 TeV的pp碰撞中J/ $ψ$产额随带电粒子赝快度密度${\rm d}N_{\rm ch}/\rm{d}η$的变化。J/ $ψ$介子产率是在双电子通道中的中快度（$|y|<0.9$）下测量的，事件是根据中快度（$|η|<1$）和前向快度（$-3.7<η<-1.7$和$2.8<η<5.1$）下的带电粒子多重性选择的;这两个观测值都被归一化到最小偏差事件中相应的平均值。归一化J/ $ψ$产额随归一化${\rm d}N_{\rm ch}/\rm{d}η$的增加明显强于线性增加，并且依赖于横向动量。将数据与理论预测进行比较，理论预测很好地描述了观察到的趋势，尽管并不总是定量的。

英文摘要：

Measurements of the inclusive J/$ψ$ yield as a function of charged-particle pseudorapidity density ${\rm d}N_{\rm ch}/\rm{d}η$ in pp collisions at $\sqrt{s}$ = 13 TeV with ALICE at the LHC are reported. The J/$ψ$ meson yield is measured at midrapidity ($|y|<0.9$) in the dielectron channel, for events selected based on the charged-particle multiplicity at midrapidity ($|η|<1$) and at forward rapidity ($-3.7<η<-1.7$ and $2.8<η<5.1$); both observables are normalized to their corresponding averages in minimum bias events. The increase of the normalized J/$ψ$ yield with normalized ${\rm d}N_{\rm ch}/\rm{d}η$ is significantly stronger than linear and dependent on the transverse momentum. The data are compared to theoretical predictions, which describe the observed trends well, albeit not always quantitatively.

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