XXVIII International Workshop on Deep Inelastic Scattering and Related Subjects

Multiplicity dependence of quarkonia production

25 Mar 2020, 15:36

23m

Brooklyn, NY

Contributed Talk QCD with Heavy Flavors and Hadronic Final States QCD with Heavy Flavors and Hadronic Final States

Speaker

Marat Siddikov (Federico Santa Maria Technical University)

Description

Abstract In this talk we present our theoretical results for the multiplicity dependence of $J/\psi$ production and compare it with recent experimental data from STAR and ALICE collaborations. We argue that a rapidly growing multiplicity dependence presents a strong evidence in favor of multigluon fusion mechanisms of the quarkonia states. We demonstrate that the experimentally observed multiplicty dependence might be described by 3-gluon fusion mechanism, whereas conventional 2-gluon fusion mechanism underestimates the experimental data. We also show that the 3-gluon fusion can correctly describe the shape of the rapidity and transverse momentum dependence, and potentially could give a sizeable contribution to produced quarkonia yields. We also make predictions for other $1S$-quarkonia states, such as $\psi (2S)$ and $\mathrm{{\rm Y}}(1S)$, and demonstrate that the multiplicity dependence for these states should be close to multiplicity dependence for $J/\psi$.

This presentation is partially based on our recent submission https://arxiv.org/abs/1910.13579.