2022/07/15 by Annalena Sophie Kalteyer, Kalteyer, Annalena Sophie
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2207.07590
Studies of open-charm hadron production in pp and \pPb collisions are performed by the ALICE Collaboration at the LHC to investigate charm-quark hadronization mechanisms. Recent measurements of charm meson (\rm D0, \rm D+, \rm D+\rm s, and \rm D*+) and baryon (Λ+\rm c, Ξ0,+\rm c, Σ0,++\rm c, and Ω0\rm c) production in pp collisions at √(s) = 5.02 TeV and √(s) = 13 TeV allow the determination of the charm cross section and the fragmentation fractions at √(s) = 5.02 TeV with unprecedented precision. The measurements show that the fragmentation fractions significantly differ from the ones measured in \rm e+e- and \ep collisions. This highlights possible differences in the hadronization process between electron induced collisions and pp collisions at the LHC. Furthermore, the first measurement of the baryon-to-meson yield ratio Λ+\rm c/\rm D0, down to p\rm T=0 in pp and \pPb collisions will be discussed. In p--Pb collisions a modification of the hadronization mechanisms could be present due to cold nuclear matter effects and collective phenomena. A systematic comparison between data and model calculations will help to understand charm quark hadronization in pp and p--Pb collisions.