The production yields of non-prompt D+s mesons, namely D+s mesons from beauty-hadron decays, were measured for the first time as a function of the transverse momentum (pT) at midrapidity (|y|<0.5) in central and semi-central Pb–Pb collisions at a centre-of-mass energy per nucleon pair √sNN = 5.02 TeV with the ALICE experiment at the LHC. The D+s mesons and their charge conjugates were reconstructed ++−+ from the hadronic decay channel Ds →φπ , with φ→K K , in the 4<36 GeV/c and 2< 24 GeV/c intervals for the 0–10% and 30–50% centrality classes, respectively. The measured yields of non-prompt D+s mesons are compared to those of prompt D+s and non-prompt D0 mesons by calculating the ratios of the production yields in Pb–Pb collisions and the nuclear modification factor RAA. The ratio between the RAA of non-prompt D+s and prompt D+s mesons, and that between the RAA of non-prompt D+s and non-prompt D0 mesons in central Pb–Pb collisions are found to be on average higher than unity in the 4 < pT < 12 GeV/c interval with a statistical significance of about 1.6 σ and 1.7 σ , respectively. The measured RAA ratios are compared with the predictions of theoretical models of heavy-quark transport in a hydrodynamically expanding QGP that incorporate hadronisation via quark recombination.
Measurement of beauty-strange meson production in Pb–Pb collisions at √sNN = 5.02 TeV via non-prompt Ds+ mesons
Colella, D.Membro del Collaboration Group
;Di Bari, D.Membro del Collaboration Group
;Mazzilli, M.Membro del Collaboration Group
;Volpe, G.Membro del Collaboration Group
;
2023-01-01
Abstract
The production yields of non-prompt D+s mesons, namely D+s mesons from beauty-hadron decays, were measured for the first time as a function of the transverse momentum (pT) at midrapidity (|y|<0.5) in central and semi-central Pb–Pb collisions at a centre-of-mass energy per nucleon pair √sNN = 5.02 TeV with the ALICE experiment at the LHC. The D+s mesons and their charge conjugates were reconstructed ++−+ from the hadronic decay channel Ds →φπ , with φ→K K , in the 4<36 GeV/c and 2< 24 GeV/c intervals for the 0–10% and 30–50% centrality classes, respectively. The measured yields of non-prompt D+s mesons are compared to those of prompt D+s and non-prompt D0 mesons by calculating the ratios of the production yields in Pb–Pb collisions and the nuclear modification factor RAA. The ratio between the RAA of non-prompt D+s and prompt D+s mesons, and that between the RAA of non-prompt D+s and non-prompt D0 mesons in central Pb–Pb collisions are found to be on average higher than unity in the 4 < pT < 12 GeV/c interval with a statistical significance of about 1.6 σ and 1.7 σ , respectively. The measured RAA ratios are compared with the predictions of theoretical models of heavy-quark transport in a hydrodynamically expanding QGP that incorporate hadronisation via quark recombination.File | Dimensione | Formato | |
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