Multiplicity dependence of quarkonia production in the CGC approach

Eugene Levin, Ivan Schmidt, Marat Siddikov*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

30 Scopus citations


In the paper we develop, in the CGC approach, a new mechanism for quarkonia production in events with high multiplicity of the soft produced particles. In this mechanism both J/ Ψ and soft hadrons are produced at short distances r∝1/Qs, where Qs is the saturation scale, which is considered to be proportional to the multiplicity of soft hadrons. Using this approach, we analyze the vigorously growing multiplicity dependence of quarkonia production, which was recently discovered by the STAR and ALICE collaborations. We demonstrate that this result presents a strong evidence in favor of multigluon fusion mechanisms of the quarkonia states. We analyze in detail the contribution of the 3-gluon fusion mechanism and demonstrate that it describes correctly all the available experimental data on the multiplicity dependence of J/ ψ meson production. We also make predictions for other quarkonia states, such as ψ(2 S) and Υ(1 S) , and find that the multiplicity dependence of these states should be similar to that of the J/ ψ meson. Finally, we discuss an experimental setup in which the very strong multiplicity dependence could be observed. This observation would be a strong evidence in favor of the CGC approach.

Original languageEnglish
Article number560
JournalEuropean Physical Journal C
Issue number6
StatePublished - 1 Jun 2020


FundersFunder number
Proyecto BasalFB 0821
Universidad Técnica Federico Santa María
Fondo Nacional de Desarrollo Científico y Tecnológico1180232, 1180118


    Dive into the research topics of 'Multiplicity dependence of quarkonia production in the CGC approach'. Together they form a unique fingerprint.

    Cite this