Multiplicity dependence of prompt and non-prompt J/ψ production at midrapidity in pp collisions at TeV


Abdallah D., Abualrob I., Acharya S., Agarwal K., Aglieri Rinella G., Aglietta L., ...More

Journal of High Energy Physics, vol.2026, no.7, 2026 (SCI-Expanded, Scopus)

  • Publication Type: Article / Article
  • Volume: 2026 Issue: 7
  • Publication Date: 2026
  • Doi Number: 10.1007/jhep07(2026)051
  • Journal Name: Journal of High Energy Physics
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, INSPEC, MathSciNet, zbMATH, Directory of Open Access Journals, Academic Search Ultimate (EBSCO), Technology Collection (ProQuest)
  • Keywords: Hadron-Hadron Scattering, Proton-Proton Scattering, Quarkonium
  • Yıldız Technical University Affiliated: Yes

Abstract

The yields of prompt and non-prompt J/ψ and the fraction of non-prompt J/ψ are measured at midrapidity (|y| < 0.9) via the dielectron decay channel as a function of the midrapidity charged-particle multiplicity (|η| < 0.9) in pp collisions at TeV. The J/ψ yields and the multiplicity are normalized by their average value in inelastic collisions. The multiplicity-dependent yield ratio between prompt J/ψ and D0 is reported. The multiplicity is further divided into three azimuthal regions with respect to the J/ψ momentum: toward the J/ψ emission direction, transverse, or opposite to it. A stronger-than-linear increase of the self-normalized yields is observed for both prompt and non-prompt J/ψ production, with similar trends. This behaviour is also observed in the toward region, while a weaker increase is observed in the transverse and away regions.