Speaker
Description
Studies of open-charm hadron production in a partonic rich environment are performed at the LHC to investigate charm-quark hadronization mechanisms. Recent measurements of different charm meson (${\rm D^0}$, ${\rm D^+}$, ${\rm D^+_{\rm s}}$, ${\rm D^{*+}}$) and baryon ($\Lambda^+_{\rm c}$, $\Xi^{0,+}_{\rm c}$, $\Sigma^{0,++}_{\rm c}$, $\Omega^0_{\rm c}$) production in pp collisions at $\sqrt{s}$ = 5.02 TeV and $\sqrt{s}$ = 13 TeV allowed the measurement of the fragmentation fractions and the charm cross section with unprecedented precision. The measurements show that the fragmentation fractions significantly differ from the ones observed in ${\rm e^+e^-}$ collisions. This contradicts the typical picture of universality of the fragmentation functions across the different collision systems.
Furthermore, the baryon to meson ratios $\Lambda^+_{\rm c}/{\rm D^0}$, measured down to $p_{\rm T}=0$, and $\Xi^{0,+}_{\rm c}/{\rm D^0}$ in p--Pb collisions will be discussed. In p--Pb collisions a modification of the hadronization mechanisms could be present due to cold nuclear matter effects and possible collective phenomena. Several models are able to reproduce the measured baryon to meson ratios. A systematic comparison between data and models will help to understand charm quark hadronization in pp and p--Pb collisions.
| Submitted on behalf of a Collaboration? | Yes |
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