Abstract
The transverse momentum distributions of , , and baryons, their antiparticles, and mesons are measured in proton-proton and proton-lead collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV over a broad rapidity range. The data, corresponding to integrated luminosities of 40.2 and 15.6 for and collisions, respectively, were collected by the CMS experiment. The nuclear modification factor , which is defined as the ratio of the particle yield in collisions and a scaled reference, is measured for each particle. A strong dependence on particle species is observed in the range from 2 to 7 GeV, where for is consistent with unity, while an enhancement ordered by strangeness content and/or particle mass is observed for the three baryons. In collisions, the strange hadron production is asymmetric about the nucleon-nucleon center-of-mass rapidity. Enhancements, which depend on the particle type, are observed in the direction of the Pb beam. The results are compared with predictions from epos lhc, which includes parametrized radial flow. The model is in qualitative agreement with the data, but fails to describe the dependence on particle species in the yield asymmetries measured away from midrapidity in collisions.
- Received 10 October 2019
- Accepted 6 April 2020
DOI:https://doi.org/10.1103/PhysRevC.101.064906
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©2020 CERN, for the CMS Collaboration