We report measurements of the production of prompt D0, D+, D∗+ and D+s mesons in Pb–Pb collisions at the centre-of-mass energy per nucleon-nucleon pair √ sNN = 5.02 TeV, in the centrality classes 0–10%, 30–50% and 60–80%. The D-meson production yields are measured at mid-rapidity (|y| < 0.5) as a function of transverse mo- mentum (pT). The pT intervals covered in central collisions are: 1 < pT < 50GeV/c for D0,2<50GeV/cforD+,3<50GeV/cforD∗+,and4<16GeV/cfor D+s mesons. The nuclear modification factors (RAA) for non-strange D mesons (D0, D+, D∗+) show minimum values of about 0.2 for pT = 6–10 GeV/c in the most central collisions and are compatible within uncertainties with those measured at √sNN = 2.76 TeV. For D+s mesons, the values of RAA are larger than those of non-strange D mesons, but compatible within uncertainties. In central collisions the average RAA of non-strange D mesons is compatible with that of charged particles for pT > 8 GeV/c, while it is larger at lower pT. The nuclear modification factors for strange and non-strange D mesons are also compared to theoretical models with different implementations of in-medium energy loss.
Measurement of D0, D+, D*+ and D s+ production in Pb-Pb collisions at √sNN=5.02 TeV
Barioglio L.;Beole S.;Bianchi L.;Botta E.;Ferretti A.;Gagliardi M.;Gallio M.;Masera M.;Puccio M.;Trogolo S.;Vercellin E.;
2018-01-01
Abstract
We report measurements of the production of prompt D0, D+, D∗+ and D+s mesons in Pb–Pb collisions at the centre-of-mass energy per nucleon-nucleon pair √ sNN = 5.02 TeV, in the centrality classes 0–10%, 30–50% and 60–80%. The D-meson production yields are measured at mid-rapidity (|y| < 0.5) as a function of transverse mo- mentum (pT). The pT intervals covered in central collisions are: 1 < pT < 50GeV/c for D0,2<50GeV/cforD+,3<50GeV/cforD∗+,and4<16GeV/cfor D+s mesons. The nuclear modification factors (RAA) for non-strange D mesons (D0, D+, D∗+) show minimum values of about 0.2 for pT = 6–10 GeV/c in the most central collisions and are compatible within uncertainties with those measured at √sNN = 2.76 TeV. For D+s mesons, the values of RAA are larger than those of non-strange D mesons, but compatible within uncertainties. In central collisions the average RAA of non-strange D mesons is compatible with that of charged particles for pT > 8 GeV/c, while it is larger at lower pT. The nuclear modification factors for strange and non-strange D mesons are also compared to theoretical models with different implementations of in-medium energy loss.File | Dimensione | Formato | |
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