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$\Lambda^+_c$ Production and Baryon-to-Meson Ratios in pp and p-Pb Collisions at $\sqrt {s_{NN}}$=5.02 TeV at the LHC (English)

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The prompt production of the charm baryon Λ$_c^+$ and the Λ$_c^+$/D$^0$ production ratios were measured at midrapidity with the ALICE detector in pp and p-Pb collisions at $\sqrt {s_{NN}}$ = 5.02 TeV. These new measurements show a clear decrease of the Λ$_c^+$/D$^0$ ratio with increasing transverse momentum ($p_T$) in both collision systems in the range 2 < $p_T$ < 12 GeV/c, exhibiting similarities with the light-flavor baryon-to-meson ratios p/π and Λ/K$_S^0$. At low $p_T$, predictions that include additional color-reconnection mechanisms beyond the leading-color approximation, assume the existence of additional higher-mass charm-baryon states, or include hadronization via coalescence can describe the data, while predictions driven by charm-quark fragmentation processes measured in e$^+$e$^-$ and e-p collisions significantly underestimate the data. The results presented in this Letter provide significant evidence that the established assumption of universality (colliding-system independence) of parton-to-hadron fragmentation is not sufficient to describe charm-baryon production in hadronic collisions at LHC energies.