Multiplicity dependence of π\pi π, K, and p production in pp collisions at sqrt{s} =13 TeVстатья
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Аннотация:This paper presents the measurements of π±\pi ^{\pm }π±, K±\mathrm {K}^{\pm }K±, p\text {p}p and p‾\overline{\mathrm{p}} p transverse momentum (pTp_{\text {T}}pT) spectra as a function of charged-particle multiplicity density in proton–proton (pp) collisions at s = 13 TeV\sqrt{s}\ =\ 13\ \text {TeV}s = 13 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 pTp_{\text {T}}pT range from 0.1 to 20 GeV/c\text {GeV}/cGeV/c and are done in the rapidity interval ∣y∣<0.5|y|<0.5∣y∣<0.5. The pTp_{\text {T}}pT-differential particle ratios exhibit an evolution with multiplicity, similar to that observed in pp collisions at s = 7 TeV\sqrt{s}\ =\ 7\ \text {TeV}s = 7 TeV, which is qualitatively described by some of the hydrodynamical and pQCD-inspired models discussed in this paper. Furthermore, the pTp_{\text {T}}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.