Multiplicity dependence of π , K, and p production in pp collisions at √s=13 TeV

Academic Article


  • © 2020, CERN for the benefit of the ALICE collaboration. This paper presents the measurements of π±, K ±, p and p ¯ transverse momentum (pT) spectra as a function of charged-particle multiplicity density in proton–proton (pp) collisions at s=13TeV with the ALICE detector at the LHC. Such study allows us to isolate the center-of-mass energy dependence of light-flavour particle production. The measurements reported here cover a pT range from 0.1 to 20 GeV / c and are done in the rapidity interval | y| < 0.5. The pT-differential particle ratios exhibit an evolution with multiplicity, similar to that observed in pp collisions at s=7TeV, which is qualitatively described by some of the hydrodynamical and pQCD-inspired models discussed in this paper. Furthermore, the pT-integrated hadron-to-pion yield ratios measured in pp collisions at two different center-of-mass energies are consistent when compared at similar multiplicities. This also extends to strange and multi-strange hadrons, suggesting that, at LHC energies, particle hadrochemistry scales with particle multiplicity the same way under different collision energies and colliding systems.
  • Authors

    Digital Object Identifier (doi)

    Pubmed Id

  • 6017186
  • Author List

  • Acharya S; Adamová D; Adler A; Adolfsson J; Aggarwal MM; Aglieri Rinella G; Agnello M; Agrawal N; Ahammed Z; Ahmad S
  • Volume

  • 80
  • Issue

  • 8