engleski

Production of light-flavor hadrons in pp collisions at √s = 7 and √s = 13 TeV

The production of π±, K±, KS0, K∗(892)0, p, ϕ(1020), Λ, Ξ−, Ω−, and their antiparticles was measured in inelastic proton–proton (pp) collisions at a center- of-mass energy of √s = 13 TeV at midrapidity (|y| <0.5) as a function of transverse momentum (pT) using the ALICE detector at the CERN LHC. Furthermore, the single-particle pT distributions of KS0, Λ, and Λ in inelastic pp collisions at √s=7 TeV are reported here for the first time. The pT distributions are studied at midrapidity within the transverse momentum range 0≤pT≤20 GeV/c, depending on the particle species. The pT spectra, integrated yields, and particle yield ratios are discussed as a function of collision energy and compared with measurements at lower √s and with results from various general-purpose QCD- inspired Monte Carlo models. A hardening of the spectra at high pT with increasing collision energy is observed, which is similar for all particle species under study. The transverse mass and xT≡2pT/ √s scaling properties of hadron production are also studied. As the collision energy increases from √s = 7–13 TeV, the yields of non- and single-strange hadrons normalized to the pion yields remain approximately constant as a function of √s, while ratios for multi-strange hadrons indicate enhancements. The pT-differential cross sections of π±, K± and p(p) are compared with next-to- leading order perturbative QCD calculations, which are found to overestimate the cross sections for π± and p(p) at high pT.

p p: scattering ; particle: yield: ratio ; hadron: production ; mass: transverse ; quantum chromodynamics: perturbation theory ; higher-order: 1 ; transverse momentum ; CERN LHC Coll ; antiparticle ; ALICE ; experimental results ; 7000 GeV-cms/nucleon ; 13000 GeV-cms/nucleon

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