Multiplicity dependence of $\pi $, K, and p production in pp collisions at $\sqrt{s} = 13$ TeV - INSPIRE

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Multiplicity dependence of $\pi$ , K, and p production in pp collisions at $\sqrt{s} = 13$ TeV

ALICE

Collaboration

Mar 4, 2020

20 pages

Published in:

Eur.Phys.J.C 80 (2020) 8, 693

Published: Aug 1, 2020

e-Print:

2003.02394 [nucl-ex]

DOI:

10.1140/epjc/s10052-020-8125-1

Report number:

CERN-EP-2020-024

Experiments:

CERN-LHC-ALICE

View in:

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Abstract: (Springer)

This paper presents the measurements of

\pi ^{\pm }

,

\mathrm {K}^{\pm }

,

\text {p}

and

\overline{\mathrm{p}}

transverse momentum (

p_{\text {T}}

) spectra as a function of charged-particle multiplicity density in proton–proton (pp) collisions at

\sqrt{s}\ =\ 13\ \text {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_{\text {T}}

range from 0.1 to 20

\text {GeV}/c

and are done in the rapidity interval

|y|<0.5

. The

p_{\text {T}}

-differential particle ratios exhibit an evolution with multiplicity, similar to that observed in pp collisions at

\sqrt{s}\ =\ 7\ \text {TeV}

, which is qualitatively described by some of the hydrodynamical and pQCD-inspired models discussed in this paper. Furthermore, the

p_{\text {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.

Note:

27 pages, 7 captioned figures, 3 tables, authors from page 22, published version, figures at http://alice-publications.web.cern.ch/node/6162

pi: production
K: production
p: production
p p: scattering
multiplicity: dependence
yield: ratio: measured
CERN LHC Coll
transverse momentum
energy dependence
hydrodynamics

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