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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

The collaboration
Phys.Rev.Lett. 127 (2021) 202301, 2021.

Abstract (data abstract)
The production cross section of prompt $\Lambda_{\rm {c}}^{+}$ charmed baryons was measured with the ALICE detector at the LHC at midrapidity in proton-proton (pp) and proton-lead (p-Pb) collisions at a centre-of-mass energy per nucleon pair of $\sqrt{s_{\rm {NN}}} = 5.02$ TeV. The $\Lambda_{\rm {c}}^{+}$ and $\Lambda_{\rm {c}}^{-}$ baryons were reconstructed in the hadronic decay channels $\Lambda_{\rm {c}}^{+} \to {\rm p} {\rm K}^{-}\pi^{+}$ and $\Lambda_{\rm {c}}^{+} \to {\rm p} {\rm K}^{0}_{S}$ and respective charge conjugates. The measured differential cross sections as a function of transverse momentum ($p_{\rm {T}}$) and the $p_{\rm {T}}$-integrated $\Lambda_{\rm {c}}^{+}$ production cross section in pp and in p-Pb collisions are presented. The $\Lambda_{\rm {c}}^{+}$ nuclear modification factor ($R_\mathrm{pPb}$), calculated from the cross sections in pp and in p-Pb collisions, is presented and compared with the $R_\mathrm{pPb}$ of D mesons. The $\Lambda_{\rm {c}}^{+}$/${\rm D}^{0}$ ratio is also presented and compared with the light-flavour baryon-to-meson ratios p$/\pi$ and $\Lambda / {\rm K}^{0}_{S}$, and measurements from other LHC experiments. The results are compared to predictions from model calculations and Monte Carlo event generators.

• #### Table 1

Data from Figure 5

10.17182/hepdata.114213.v1/t1

Prompt $\Lambda_{\rm {c}}^{+}$ baryon $p_{\rm {T}}$-differential cross section in pp collisions at $\sqrt{s} = 5.02$ TeV in the rapidity interval...

• #### Table 2

Data from Figure 7

10.17182/hepdata.114213.v1/t2

Prompt $\Lambda_{\rm {c}}^{+}$ baryon $p_{\rm {T}}$-differential cross section in p-Pb collisions at $\sqrt{s_{\rm {NN}}} = 5.02$ TeV in the rapidity...

• #### Table 3

Data from Figure 8

10.17182/hepdata.114213.v1/t3

The nuclear modification factor $R_\mathrm{pPb}$ of prompt $\Lambda_{\rm {c}}^{+}$ baryons in p-Pb collisions at $\sqrt{s_{\rm {NN}}} = 5.02$ TeV in...

• #### Table 4

Data from Figure 10

10.17182/hepdata.114213.v1/t4

The $\Lambda_{\rm {c}}^{+}$/${\rm D}^{0}$ ratio as a function of $p_{\rm {T}}$ measured in pp collisions at $\sqrt{s} = 5.02$ TeV...

• #### Table 5

Data from Figure 10

10.17182/hepdata.114213.v1/t5

The $\Lambda_{\rm {c}}^{+}$/${\rm D}^{0}$ ratio as a function of $p_{\rm {T}}$ measured in p-Pb collisions at $\sqrt{s_{\rm {NN}}} = 5.02$...

• #### Table 6

Data from Figure 12

10.17182/hepdata.114213.v1/t6

The $\Lambda_{\rm {c}}^{+}$/${\rm D}^{0}$ ratio measured in p-Pb collisions at $\sqrt{s_{\rm {NN}}} = 5.02$ TeV in the transverse momentum interval...

• #### Table 7

Data from Equations 7, 8, 9 and 10

10.17182/hepdata.114213.v1/t7

$p_{\rm {T}}$-integrated prompt $\Lambda_{\rm {c}}^{+}$ baryon cross section in pp collisions at $\sqrt{s} = 5.02$ TeV in the rapidity interval...

• #### Table 8

Data from Table 3 (first and second row)

10.17182/hepdata.114213.v1/t8

$p_{\rm {T}}$-integrated ($p_{\rm {T}} > 0$) $\Lambda_{\rm {c}}^{+}$/${\rm D}^{0}$ ratio in pp collisions at $\sqrt{s} = 5.02$ TeV in the...