Measurements of directed and elliptic flow for D0 and D0‾ mesons using the STAR detector at RHIC

Abstract

We report on the first evidence for a non-zero rapidity-odd directed flow (νv1) for D0 and D0‾ mesons in 10-80% centrality Au+Au collisions at sNN=200GeV measured with the STAR detector at RHIC. The slope of the ν1 rapidity dependence (dν1/dy) averaged over D0 and D0‾ mesons is -0.081 ± 0.021 ± 0.017, while that of charged kaons is -0.0030 ± 0.0001 ± 0.0002, suggesting significantly larger slope for the D0 mesons. Models indicate that the large dν1/dy of D0 mesons is sensitive to the initially tilted source. We also present a new measurement of the D0 meson elliptic flow (ν2) as a function of transverse momentum (pT) in Au+Au collisions at sNN=200GeV with an improved precision with respect to the previously published results.The D0 ν2 results are compared to those of light-flavor hadrons to test the number-of-constituent-quark (NCQ) scaling. Both the ν1 and ν2 results are compared to recent hydrodynamic and transport model calculations.