Abstract (data abstract)

The production of prompt $\Lambda_\mathrm{c}^+$ baryons has been measured at midrapidity in the transverse momentum interval $0<p_\mathrm{T}<1$ GeV/$c$ for the first time, in pp and p–Pb collisions at a centre-of-mass energy per nucleon--nucleon collision $\sqrt{s_\mathrm{NN}} = 5.02$ TeV. The measurement was performed in the decay channel $\Lambda_\mathrm{c}^{+}\rightarrow \mathrm{pK}^{0}_\mathrm{S}$ by applying new decay reconstruction techniques using a Kalman-Filter vertexing algorithm and adopting a machine-learning approach for the candidate selection. The $p_\mathrm{T}$-integrated $\Lambda_\mathrm{c}^+$ production cross sections in both collision systems were determined and used along with the measured yields in \PbPb collisions to compute the $p_\mathrm{T}$-integrated nuclear modification factors $R_\mathrm{pPb}$ and $R_\mathrm{AA}$ of $\Lambda_\mathrm{c}^+$ baryons, which are compared to model calculations that consider nuclear modification of the parton distribution functions. The $\Lambda_\mathrm{c}^+/\mathrm{D}^0$ baryon-to-meson ratio is reported for pp and p–Pb collisions. Comparisons with models that include modified hadronisation processes are presented, and the implications of the results on the understanding of charm hadronisation in hadronic collisions are discussed. A significant ($3.7\sigma$) modification of the mean transverse momentum of $\Lambda_\mathrm{c}^+$ baryons is seen in p–Pb collisions with respect to pp collisions, while the $p_\mathrm{T}$-integrated $\Lambda_\mathrm{c}^+/\mathrm{D}^0$ yield ratio was found to be consistent between the two collision systems within the uncertainties.

Table 1

Data from Figure 3.

10.17182/hepdata.140485.v1/t1

The $p_\mathrm{T}$-differential prompt $\Lambda_\mathrm{c}^{+}$ production cross sections per unit rapidity in pp collisions for $|y| < 0.5$, at $\sqrt{s} =...
Table 2

Data from Figure 3.

10.17182/hepdata.140485.v1/t2

The $p_\mathrm{T}$-differential prompt $\Lambda_\mathrm{c}^{+}$ production cross sections per unit rapidity in p-Pb collisions for $-0.96<y_\mathrm{cms}<0.04$, at $\sqrt{s_\mathrm{NN}} = 5.02$ TeV....
Table 3

Data from Table 4.

10.17182/hepdata.140485.v1/t3

The $p_\mathrm{T}$-integrated production cross sections per unit rapidity for prompt $\Lambda_\mathrm{c}^{+}$ baryons in pp and p-Pb collisions at $\sqrt{s_\mathrm{NN}} =...
Table 4

Data from Figure 4.

10.17182/hepdata.140485.v1/t4

The nuclear modification factor $R_\mathrm{pPb}$ for prompt $\Lambda_\mathrm{c}^{+}$ production in p-Pb collisions at $\sqrt{s_\mathrm{NN}} = 5.02$ TeV. Data for $1<p_\mathrm{T}...
Table 5

Data from Table 5.

10.17182/hepdata.140485.v1/t5

The $p_\mathrm{T}$-integrated nuclear modification factors $R_\mathrm{pPb}$ and $R_\mathrm{AA}$ for prompt $\Lambda_\mathrm{c}^{+}$ production in p-Pb and Pb-Pb collisions at $\sqrt{s_\mathrm{NN}} =...
Table 6

Data from Table 6.

10.17182/hepdata.140485.v1/t6

Mean transverse momentum values for prompt $\Lambda_\mathrm{c}^{+}$ baryons at midrapidity in pp and p-Pb collisions at $\sqrt{s_\mathrm{NN}} = 5.02$ TeV.
Table 7

Data from Figure 6.

10.17182/hepdata.140485.v1/t7

The prompt $\Lambda_{\rm {c}}^{+}$/${\rm D}^{0}$ yield ratio measured in pp collisions at $\sqrt{s} = 5.02$ TeV as a function of...
Table 8

Data from Figure 6.

10.17182/hepdata.140485.v1/t8

The prompt $\Lambda_{\rm {c}}^{+}$/${\rm D}^{0}$ yield ratio measured in p-Pb collisions at $\sqrt{s_{\rm {NN}}} = 5.02$ TeV as a function...
Table 9

Data from Table 7.

10.17182/hepdata.140485.v1/t9

The integrated prompt $\Lambda_\mathrm{c}^{+}/\mathrm{D}^0$ baryon-to-meson yield ratios in pp and p-Pb collisions at $\sqrt{s_{\rm {NN}}} = 5.02$ TeV.

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