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arXiv · 2504.00686

Multiplicity-dependent inclusive J/$ψ$ production at forward rapidity in pp collisions at $\mathbf{\sqrt{s} = 13}$ TeV

ALICE Collaboration
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Abstract

This paper presents a study of the inclusive forward $J/ψ$ yield as a function of forward charged-particle multiplicity in pp collisions at $\sqrt{s} =13$ TeV using data collected by the ALICE experiment at the CERN LHC. The results are presented in terms of relative $J/ψ$ yields and relative charged-particle multiplicities with respect to these quantities obtained in inelastic collisions having at least one charged particle in the pseudorapidity range $|η| < 1$. The $J/ψ$ mesons are reconstructed via their decay into $μ^+ μ^-$ pairs in the forward rapidity region ($2.5 < y < 4$). The relative multiplicity is estimated in the forward pseudorapidity range which overlaps with the $J/ψ$ rapidity region. The results show a steeper-than-linear increase of the $J/ψ$ yields versus the multiplicity. They are compared with previous measurements and theoretical model calculations.

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ALICE Collaboration. 2025-11-17. Multiplicity-dependent inclusive J/$ψ$ production at forward rapidity in pp collisions at $\mathbf{\sqrt{s} = 13}$ TeV. https://doi.org/10.1007/jhep07(2025)238

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