Production of charged pions, kaons and (anti-)protons in Pb-Pb and inelastic pp collisions at = 5.02 TeV
arXiv:1910.07678 · doi:10.1103/PhysRevC.101.044907
Abstract
Mid-rapidity production of , and ()p measured by the ALICE experiment at the LHC, in Pb-Pb and inelastic pp collisions at = 5.02 TeV, is presented. The invariant yields are measured over a wide transverse momentum () range from hundreds of MeV/ up to 20 GeV/. The results in Pb-Pb collisions are presented as a function of the collision centrality, in the range 090%. The comparison of the -integrated particle ratios, i.e. proton-to-pion (p/) and kaon-to-pion (K/) ratios, with similar measurements in Pb-Pb collisions at = 2.76 TeV show no significant energy dependence. Blast-wave fits of the spectra indicate that in the most central collisions radial flow is slightly larger at 5.02 TeV with respect to 2.76 TeV. Particle ratios (p/, K/) as a function of show pronounced maxima at 3 GeV/ in central Pb-Pb collisions. At high , particle ratios at 5.02 TeV are similar to those measured in pp collisions at the same energy and in Pb-Pb collisions at = 2.76 TeV. Using the pp reference spectra measured at the same collision energy of 5.02 TeV, the nuclear modification factors for the different particle species are derived. Within uncertainties, the nuclear modification factor is particle species independent for high and compatible with measurements at = 2.76 TeV. The results are compared to state-of-the-art model calculations, which are found to describe the observed trends satisfactorily.
39 pages, 16 captioned figures, 5 tables, authors from page 34, published version, figures at http://alice-publications.web.cern.ch/node/5573
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