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Transverse-momentum and event-shape dependence of D-meson flow harmonics in Pb–Pb collisions at sNN =5.02TeV

Journal Article · · Physics Letters. B
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The elliptic and triangular flow coefficients v2 and v3 of prompt D0 , D+ , and D*+ mesons were measured at midrapidity ( |y|<0.8 ) in Pb–Pb collisions at the centre-of-mass energy per nucleon pair of sNN =5.02TeV with the ALICE detector at the LHC. The D mesons were reconstructed via their hadronic decays in the transverse momentum interval 1< pT <36GeV/c in central (0–10%) and semi-central (30–50%) collisions. Compared to pions, protons, and J/ψ mesons, the average D-meson vn harmonics are compatible within uncertainties with a mass hierarchy for pT 3GeV/c , and are similar to those of charged pions for higher pT . The coupling of the charm quark to the light quarks in the underlying medium is further investigated with the application of the event-shape engineering (ESE) technique to the D-meson v2 and pT -differential yields. The D-meson v2 is correlated with average bulk elliptic flow in both central and semi-central collisions. Within the current precision, the ratios of per-event D-meson yields in the ESE-selected and unbiased samples are found to be compatible with unity. All the measurements are found to be reasonably well described by theoretical calculations including the effects of charm-quark transport and the recombination of charm quarks with light quarks in a hydrodynamically expanding medium.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF); USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Organization:
The ALICE collaboration
Grant/Contract Number:
AC05-00OR22725; AC02-05CH11231
OSTI ID:
1787963
Alternate ID(s):
OSTI ID: 1811511
OSTI ID: 1822019
Journal Information:
Physics Letters. B, Journal Name: Physics Letters. B Vol. 813; ISSN 0370-2693
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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