Speaker
Description
Measurements of charm hadrons with strange-quark content provide a sensitive test of charm-quark hadronization across collision systems. In Pb–Pb collisions, they probe hadronization in the quark–gluon plasma (QGP): if charm quarks partially hadronize via recombination with (anti)strange quarks abundant in the medium, the yields of charm–strange hadrons should be enhanced relative to non-strange charm hadrons compared with proton–proton (pp) collisions. Further insight comes from excited charm–strange mesons, which decay to both strange and non-strange ground-state D mesons.
This contribution presents a comprehensive measurement of the $\mathrm{D_s^+/D^+}$ production ratio from low-multiplicity pp collisions at $\sqrt{s}=13.6$ TeV to high-multiplicity Pb–Pb collisions at $\sqrt{s_\mathrm{NN}}=5.36$ TeV. The ratio shows a smooth evolution with system size and a significant enhancement in Pb–Pb relative to pp collisions. The first $p\mathrm{_T}$-differential production cross sections of the orbitally excited $\mathrm{D_{s1}(2536)^+}$ and $\mathrm{D_{s2}(2573)^{*+}}$ mesons in pp collisions at $\sqrt{s}=13.6$ TeV is also reported, together with their production ratios to the $\mathrm{D_s^+}$ ground state. Finally, the first measurement of $\Xi\mathrm{_c^0}$ production in Pb–Pb collisions at $\sqrt{s_\mathrm{NN}}=5.02$ TeV is presented, including yield ratios to strange and non-strange charm mesons and baryons in central and semicentral events.
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