Speaker
Description
Charm-baryon production measurements in proton-proton (pp) collisions at the LHC are fundamental tools to investigate the charm-quark hadronisation and to test pQCD calculations. Recent measurements in pp collisions have shown baryon-to-meson ratios significantly larger than those in $\mathrm{e^+e^-}$ collisions, challenging the validity of theoretical calculations based on the factorisation approach, which assumes universal charm fragmentation functions across collision systems. Additionally, these measurements allow for the study of possible hadronisation modifications in presence of nuclear-matter effects in larger collision systems (e.g. p-Pb).
In this contribution, preliminary results on the production of $\Sigma_{\rm c}^{0,++}$(2455) and $\Sigma_{\rm c}^{0,++}$(2520) baryon resonances in pp collisions at $\sqrt{s}$ = 13.6 TeV are presented. A first look at the $\Lambda_{\rm c}^{+}$/${\rm D}^0$ production-yield ratios in the same collision system is also discussed. Additionally, the final ALICE results on the fragmentation fractions of charm quarks into hadrons in pp and p--Pb collisions from Run 2 data sample are presented, along with the final measurement of $\Omega_\mathrm{c}^0$ baryon from the semileptonic decay channel $\Omega^-{\rm e}^+\nu_{\rm e}$ in pp collisions at $\sqrt{s}$ = 13 TeV. The results are compared with predictions from novel theoretical models that consider different hadronisation mechanisms with respect to in-vacuum fragmentation.
| Category | Experiment |
|---|---|
| Collaboration | ALICE |
