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

Abstract

This paper presents a study of the inclusive forward $J/\ddot{I}ˆ$ 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 $J/\ddot{I}ˆ$ 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 $|\hat{I}\cdot |<1$. The $J/\ddot{I}ˆ$ mesons are reconstructed via their decay into $\hat{I}{¼}^{+}\hat{I}{¼}^{-}$ pairs in the forward rapidity region ($2.5<y<4$). The relative multiplicity is estimated in the forward pseudorapidity range which overlaps with the $J/\ddot{I}ˆ$ rapidity region. The results show a steeper-than-linear increase of the $J/\ddot{I}ˆ$ yields versus the multiplicity. They are compared with previous measurements and theoretical model calculations.

23 pages, 3 captioned figures, 1 table, authors from page 17, figures at http://alice-publications.web.cern.ch/node/12344