Abstract
Transverse momentum spectra of charged pions, kaons, and protons are measured in proton-proton collisions at sqrt(s) = 13 TeV with the CMS detector at the LHC. The particles, identified via their energy loss in the silicon tracker, are measured in the transverse momentum range of pt ~ 0.1-1.7 GeV and rapidities abs(y) < 1. The pt spectra and integrated yields are compared to previous results at smaller sqrt(s) and to predictions of Monte Carlo event generators. The average pt increases with particle mass and charged particle multiplicity of the event. Comparisons with previous CMS results at sqrt(s) = 0.9, 2.76, and 7 TeV show that the average pt and the ratios of hadron yields feature very similar dependences on the particle multiplicity in the event, independently of the center-of-mass energy of the pp collision.
Highlights
The study of hadron production has a long history in high-energy particle, nuclear, and cosmic ray physics
Parton hadronization and final-state effects are mostly constrained from elementary eþe− collisions, whose final states are largely dominated by simple qqfinal states, whereas lowpT hadrons at the LHC issue from the fragmentation of multiple gluon “minijets” [1]
For the pT spectra, the average transverse momentum hpTi, and the ratios of particle yields, the data are compared to the predictions of PYTHIA 8, EPOS, and PYTHIA 6
Summary
The study of hadron production has a long history in high-energy particle, nuclear, and cosmic ray physics. The absolute yields and the transverse momentum (pT) spectra of identified hadrons in high-energy hadron-hadron collisions are among the most basic physical observables They can be used to improve the modeling of various key ingredients of Monte Carlo (MC) hadronic event generators, such as multiparton interactions, parton hadronization, and final-state effects (such as parton correlations in color, pT, spin, baryon and strangeness number, and collective flow) [1]. Parton hadronization and final-state effects are mostly constrained from elementary eþe− collisions, whose final states are largely dominated by simple qqfinal states, whereas lowpT hadrons at the LHC issue from the fragmentation of multiple gluon “minijets” [1] Such large differences have a important impact on baryons and strange hadrons, whose production in pp collisions is not well reproduced by the existing models [2,3], and affect the modeling of hadronic interactions of ultrahigh-energy cosmic rays with Earth’s atmosphere [4]. The analysis adopts the same methods as used in previous CMS measurements of pion,pkffiaffi on, and proton production in pp and pPb collisions at s of 0.9, 2.76, and 7 TeV [2,10], as well as those performed by the ALICE Collaboration at 2.76 and 7 TeV [3,11]
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