Abstract
Midrapidity production of , and measured by the ALICE experiment at the CERN Large Hadron Collider, in Pb-Pb and inelastic collisions at TeV, is presented. The invariant yields are measured over a wide transverse momentum () range from hundreds of up to 20 . The results in Pb-Pb collisions are presented as a function of the collision centrality, in the range . The comparison of the -integrated particle ratios, i.e., proton-to-pion () and kaon-to-pion () ratios, with similar measurements in Pb-Pb collisions at 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 () as a function of show pronounced maxima at in central Pb-Pb collisions. At high , particle ratios at 5.02 TeV are similar to those measured in collisions at the same energy and in Pb-Pb collisions at 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 TeV. The results are compared to state-of-the-art model calculations, which are found to describe the observed trends satisfactorily.
9 More- Received 14 November 2019
- Accepted 2 March 2020
DOI:https://doi.org/10.1103/PhysRevC.101.044907
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
©2020 CERN, for the ALICE Collaboration