Abstract
The prompt D^{0} meson azimuthal anisotropy coefficients, v_{2} and v_{3}, are measured at midrapidity (|y|<1.0) in Pb-Pb collisions at a center-of-mass energy sqrt[s_{NN}]=5.02 TeV per nucleon pair with data collected by the CMS experiment. The measurement is performed in the transverse momentum (p_{T}) range of 1 to 40 GeV/c, for central and midcentral collisions. The v_{2} coefficient is found to be positive throughout the p_{T} range studied. The first measurement of the prompt D^{0} meson v_{3} coefficient is performed, and values up to 0.07 are observed for p_{T} around 4 GeV/c. Compared to measurements of charged particles, a similar p_{T} dependence, but smaller magnitude for p_{T}<6 GeV/c, is found for prompt D^{0} meson v_{2} and v_{3} coefficients. The results are consistent with the presence of collective motion of charm quarks at low p_{T} and a path length dependence of charm quark energy loss at high p_{T}, thereby providing new constraints on the theoretical description of the interactions between charm quarks and the quark-gluon plasma.
Highlights
The formation of a strongly coupled quark-gluon plasma (QGP), a state of matter comprising deconfined quarks and gluons and exhibiting near-perfect liquid behavior, was established first in experiments performed at the Relativistic Heavy Ion Collider (RHIC) [1,2,3,4] and later confirmed at the CERN Large Hadron Collider (LHC) [5,6]
The measurements can help explore the coalescence production mechanism for charm hadrons where charm quarks recombine with light quarks from the medium, which could lead to positive charm hadron vn [11,12]
The D0 meson v2 results from STAR suggest that the charm quarks have achieved local thermal equilibrium with the QGP medium in the hydrodynamic picture [23]
Summary
The formation of a strongly coupled quark-gluon plasma (QGP), a state of matter comprising deconfined quarks and gluons and exhibiting near-perfect liquid behavior, was established first in experiments performed at the Relativistic Heavy Ion Collider (RHIC) [1,2,3,4] and later confirmed at the CERN Large Hadron Collider (LHC) [5,6]. The D meson v2 coefficient, which can provide cleaner information on the interactions between charm quarks and the medium, has been measured [23,24,25].
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