Published January 1, 2021 | Version v1
Journal article Open

Production of light-flavor hadrons in pp collisions at $\sqrt{s}\phantom{\rule{3.33333pt}{0ex}}=\phantom{\rule{3.33333pt}{0ex}}7\phantom{\rule{0.333333em}{0ex}}\text{and}\phantom{\rule{0.333333em}{0ex}}\sqrt{s}=13\phantom{\rule{0.166667em}{0ex}}\phantom{\rule{0.333333em}{0ex}}\text{TeV}$

  • 1. CERN

Description

The production of ${\pi }^{±}$ , ${K}^{±}$ , ${K}_{S}^{0}$ , ${K}^{\ast }{\left(892\right)}^{0}$ , $p$ , $\varphi \left(1020\right)$ , $\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 ( ${p}_{T}$ ) using the ALICE detector at the CERN LHC. Furthermore, the single-particle ${p}_{T}$ distributions of ${K}_{S}^{0}$ , $\Lambda $ , and $\overline{\Lambda }$ in inelastic pp collisions at $\sqrt{s}=7$ TeV are reported here for the first time. The ${p}_{T}$ distributions are studied at midrapidity within the transverse momentum range $0\le {p}_{T}\le 20$ GeV/c, depending on the particle species. The ${p}_{T}$ 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 ${p}_{T}$ with increasing collision energy is observed, which is similar for all particle species under study. The transverse mass and ${x}_{T}\equiv 2{p}_{T}/\sqrt{s}$ 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 ${p}_{T}$ -differential cross sections of ${\pi }^{±}$ , ${K}^{±}$ and $p$ ( $\overline{p}$ ) are compared with next-to-leading order perturbative QCD calculations, which are found to overestimate the cross sections for ${\pi }^{±}$ and $p$ ( $\overline{p}$ ) at high ${p}_{T}$ .

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