Orateur
Description
Ratios of production yields of different charm hadron species are a sensitive observable to study the hadronization process.
Recently, the ALICE Collaboration reported the production yield of charm baryons ($\Lambda_\mathrm{c}^{+}$, $\Sigma_\mathrm{c}^{0,++}$, $\Xi_\mathrm{c}^{0,+}$, $\Omega_\mathrm{c}^{0}$) relative to that of $\mathrm{D}$ mesons in proton--proton collisions.
The measured baryon-to-meson ratios show significant enhancement compared to those measured in $\mathrm{e}^{+}\mathrm{e}^{-}$ collisions, implying that the hadronization process of charm quark is not universal across the different collision systems.
Various models implementing a modified hadronization of charm quarks in hadronic collisions, which enhance the production of baryons, can describe these enhancements of $\Lambda_\mathrm{c}^{+}$ and $\Sigma_\mathrm{c}^{0,++}$ which do not include strange quark.
These models predict a similar behaviour for charm baryons with strange-quark content ($\Xi_\mathrm{c}^{0,+}$ and $\Omega_\mathrm{c}^{0}$), however they still cannot quantitatively describe the experimental results.
Therefore, more differential measurements, such as a function of charged-particle multiplicity, need to be provided to understand the hadronization process of charm quarks.
The ALICE Collaboration also performed a measurement of $\Lambda_\mathrm{c}^{+}$ baryon production as a function of charged-particle multiplicity in pp collisions at $\sqrt{s}$ = 13 TeV.
The measured production yield ratio $\Lambda_\mathrm{c}^{+}$/$\mathrm{D}^0$ shows a remarkable modification of the $\it{p}_{\mathrm{T}}$ dependence as a function of the charged-particle multiplicity.
A similar measurements for $\Xi_\mathrm{c}^{0,+}$ is expected to provide further constraints for understanding the hadronization process of charm quarks.
In this contribution, the production yield of $\Xi_\mathrm{c}^{+}$ baryons as a function of charged-particle multiplicity at midrapidity in pp collisions at $\sqrt{s}$ = 13 TeV will be shown.
Both minimum-bias and high-multiplicity triggered pp collisions collected by the ALICE detector during the LHC Run 2 data taking period were exploited.
The $\Xi_\mathrm{c}^{+}$ baryon was reconstructed via its hadronic decay channel, $\Xi_\mathrm{c}^{+} \rightarrow \Xi^{-} \pi^{+} \pi^{+}$. The production yield ratio between $\Xi_\mathrm{c}^{+}$ baryons and $\mathrm{D}^0$ mesons as a function of charged-particle multiplicity will be presented as well.
