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

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The ALICE Collaboration , Acharya , S , Adamova , D , Kim , D J , Krizek , F , Novitzky , N , Parkkila , J E , Rak , J , Rasanen , S S , Rytkonen , H , Saarimäki , O A M , Slupecki , M , Trzaska , W H & Zhou , Z 2020 , ' Multiplicity dependence of pi, K, and p production in pp collisions at root s=13 TeV ' , European Physical Journal C. Particles and Fields , vol. 80 , no. 8 , 693 . https://doi.org/10.1140/epjc/s10052-020-8125-1

Title: Multiplicity dependence of pi, K, and p production in pp collisions at root s=13 TeV
Author: The ALICE collaboration; Acharya, S.; Adamova, D.; Kim, D. J.; Krizek, F.; Novitzky, N.; Parkkila, J. E.; Rak, J.; Rasanen, S. S.; Rytkonen, H.; Saarimäki, O. A. M.; Slupecki, M.; Trzaska, W. H.; Zhou, Z.
Contributor: University of Helsinki, University of Jyväskylä
University of Helsinki, The Czech Academy of Sciences
University of Helsinki, University of Tsukuba
University of Helsinki, University of Jyväskylä
University of Helsinki, University of Jyväskylä
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, University of Jyväskylä
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, University of Jyväskylä
University of Helsinki, University of Jyväskylä
University of Helsinki, University of Bergen
Date: 2020-08-01
Language: eng
Number of pages: 20
Belongs to series: European Physical Journal C. Particles and Fields
ISSN: 1434-6044
URI: http://hdl.handle.net/10138/321559
Abstract: This paper presents the measurements of pi(+/-), K-+/-, p and (p) over bar transverse momentum (p(T)) spectra as a function of charged-particle multiplicity density in proton-proton (pp) collisions at root s = 13 TeV with the ALICE detector at the LHC. Such study allows us to isolate the center-ofmass 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 p(T)-differential particle ratios exhibit an evolution with multiplicity, similar to that observed in pp collisions at v s = 7 TeV, 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.
Subject: 114 Physical sciences
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