Multiplicity dependence of $\pi $, K, and p production in pp collisions at $\sqrt{s} = 13$ TeV
Eur.Phys.J.C 80 (2020) 693, 2020.
The ALICE collaboration

Abstract (data abstract)
This paper presents the measurements of $\pi^{\pm}$, $K^{\pm}$, $p$ and $\bar{p}$ transverse momentum ($p_{\rm T}$) spectra as a function of charged-particle multiplicity density in proton-proton (pp) collisions at $\sqrt{s} = 13\ {\rm TeV}$ 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 $p_{\rm T}$ range from 0.1 ${\rm GeV}/c$ to 20 ${\rm GeV}/c$ and are done in the rapidity interval $|y|<0.5$. The $p_{\rm T}$-differential particle ratios exhibit an evolution with multiplicity, similar to that observed in pp collisions at $\sqrt{s} = 7\ {\rm TeV}$, which is qualitatively described by some of the hydrodynamical and pQCD-inspired models discussed in this paper. Furthermore, the $p_{\rm T}$-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.

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