Production of light-flavor hadrons in pp collisions at $\sqrt{s}~=~7\text { and }\sqrt{s} = 13 \, \text { TeV} $

Acharya, Shreyasi; Adamova, Dagmar; Adler, Alexander; Adolfsson, Jonatan; Aggarwal, Madan Mohan; Aglieri Rinella, Gianluca; Agnello, Michelangelo; Agrawal, Neelima; Ahammed, Zubayer; Ahmad, Shakeel

doi:10.1140/epjc/s10052-020-08690-5

Production of light-flavor hadrons in pp collisions at $\sqrt{s}~=~7\text { and }\sqrt{s} = 13 \, \text { TeV}$

ALICE

Collaboration

May 22, 2020

41 pages

Published in:

Eur.Phys.J.C 81 (2021) 3, 256

Published: Mar 24, 2021

e-Print:

2005.11120 [nucl-ex]

DOI:

10.1140/epjc/s10052-020-08690-5

Report number:

CERN-EP-2020-059

Experiments:

CERN-LHC-ALICE

View in:

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Abstract: (Springer)

The production of

\pi ^{\pm }

,

\mathrm{K}^{\pm }

,

\mathrm{K}^{0}_{S}

,

\mathrm{K}^{*}(892)^{0}

,

\mathrm{p}

,

\phi (1020)

,

\Lambda

,

\Xi ^{-}

,

\Omega ^{-}

, and their antiparticles was measured in inelastic proton–proton (pp) collisions at a center-of-mass energy of

\sqrt{s}

= 13 TeV at midrapidity (

|y|<0.5

) as a function of transverse momentum (

p_{\mathrm{T}}

) using the ALICE detector at the CERN LHC. Furthermore, the single-particle

p_{\mathrm{T}}

distributions of

\mathrm{K}^{0}_{S}

,

\Lambda

, and

\overline{\Lambda }

in inelastic pp collisions at

\sqrt{s} = 7

TeV are reported here for the first time. The

p_{\mathrm{T}}

distributions are studied at midrapidity within the transverse momentum range

0\le p_{\mathrm{T}}\le 20

GeV/c, depending on the particle species. The

p_{\mathrm{T}}

spectra, integrated yields, and particle yield ratios are discussed as a function of collision energy and compared with measurements at lower

\sqrt{s}

and with results from various general-purpose QCD-inspired Monte Carlo models. A hardening of the spectra at high

p_{\mathrm{T}}

with increasing collision energy is observed, which is similar for all particle species under study. The transverse mass and

x_{\mathrm{T}}\equiv 2p_{\mathrm{T}}/\sqrt{s}

scaling properties of hadron production are also studied. As the collision energy increases from

\sqrt{s}

= 7–13 TeV, the yields of non- and single-strange hadrons normalized to the pion yields remain approximately constant as a function of

\sqrt{s}

, while ratios for multi-strange hadrons indicate enhancements. The

p_\mathrm{{T}}

-differential cross sections of

\pi ^{\pm }

,

\mathrm {K}^{\pm }

and

\mathrm {p}

(

\overline{\mathrm{p}}

) are compared with next-to-leading order perturbative QCD calculations, which are found to overestimate the cross sections for

\pi ^{\pm }

and

\mathrm{p}

(

\overline{\mathrm{p}}

) at high

p_\mathrm{{T}}

.

Note:

54 pages, 18 figures, 8 tables, authors from page 49, published version, figures at http://alice-publications.web.cern.ch/node/6218

p p: scattering
particle: yield: ratio
hadron: production
mass: transverse
quantum chromodynamics: perturbation theory
higher-order: 1
transverse momentum
CERN LHC Coll
antiparticle
ALICE

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Production of light-flavor hadrons in pp collisions at s = 7 and s=13 TeV\sqrt{s}~=~7\text { and }\sqrt{s} = 13 \, \text { TeV} s​ = 7 and s​=13 TeV

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Production of light-flavor hadrons in pp collisions at $\sqrt{s}~=~7\text { and }\sqrt{s} = 13 \, \text { TeV}$