First measurement of \mathbf\rm Ξ_{\rm c}⁰ production in Pb-Pb collisions at \mathbf√s_{\rm NN} = 5.02 TeV

2026/07/20 by ALICE Collaboration
#nucl-ex #hep-ex

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Abstract

The ALICE Collaboration reports the first measurement of the production of prompt Ξ_{\mathrm c}⁰ baryons in nucleus-nucleus collisions by analyzing data from Pb-Pb collisions at √s_NN~=5.02~TeV. The production and transverse-momentum (p_{\mathrm T}) differential spectra of Ξ_{\mathrm c}⁰ are particularly sensitive to the hadronization process and to strangeness production in the quark--gluon plasma formed in high-energy heavy-ion collisions. The Ξ_{\mathrm c}⁰ baryons are reconstructed at midrapidity (|y|<0.5) in the transverse-momentum intervals 3<p_{\mathrm T}~<12~GeV/c and 4<p_{\mathrm T}~<12~GeV/c in the 0-10% and 30-50% centrality intervals, respectively. The nuclear modification factor (R_AA) reaches values up to 3 in the interval 3<p_{\mathrm T}~<4~GeV/c, which is the largest value measured so far for charm hadrons. Model predictions are compatible with the measured R_AA, while, in the measured p_{\mathrm T} intervals, they underestimate the production yield as well as the measured Ξ_{\mathrm c}⁰/D⁰, Ξ_{\mathrm c}⁰/Λ_{\mathrm c}⁺, and Ξ_{\mathrm c}⁰/D⁺_{\mathrm s} yield ratios.

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