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 sqrt(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 D_s^+ -> phi pi+, with phi -> K+ K-, in the 4 < pT < 36 GeV/c and 2 < pT < 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 sigma and 1.7 sigma, 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=5.02TeV via non-prompt Ds + mesons
Cortese P.;Ramello L.;Sitta M.;
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 sqrt(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 D_s^+ -> phi pi+, with phi -> K+ K-, in the 4 < pT < 36 GeV/c and 2 < pT < 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 sigma and 1.7 sigma, 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 | |
---|---|---|---|
1-s2.0-S0370269322006955-main.pdf
file ad accesso aperto
Descrizione: Articolo
Tipologia:
Versione Editoriale (PDF)
Licenza:
Creative commons
Dimensione
1.74 MB
Formato
Adobe PDF
|
1.74 MB | Adobe PDF | Visualizza/Apri |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.