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3–9 Nov 2019
Wanda Reign Wuhan Hotel
Asia/Shanghai timezone

Measurement of D0 and D0 directed flow using KFParticle in Au+Au collisions at sNN = 200 GeV from STAR

4 Nov 2019, 17:40
20m
Wanda Han Show Theatre & Wanda Reign Wuhan Hotel

Wanda Han Show Theatre & Wanda Reign Wuhan Hotel

Poster Presentation Heavy flavor and quarkonium Poster Session

Speaker

Xinyue Ju (University of Science and Technology of China)

Description

Charm quarks, owing to their large mass, are predominantly created through initial hard scatterings in relativistic heavy-ion collisions and thus are ideal probes to study early time dynamics of these collisions. Recent results from STAR show that the slope of D0 mesons directed flow (v1) versus rapidity is about 25 times larger than that of charged kaons, providing important constraints on the initial geometry and charm quark transport in the QGP. It has also been predicted that the transient electromagnetic field generated at early time can induce a difference between the v1 of charm and anti-charm quarks, and the magnitude of this difference can be much larger than those of light-flavor hadrons due to the early formation of charm quarks.

In this poster, we will present a new measurement of the directed flow for D0 and D0 mesons in Au+Au collisions at sNN = 200 GeV using data collected with the HeavyFlavor Tracker during the 2014 RHIC run. The D0 (D0) mesons are reconstructed by an algorithm based on the Kalman Filter (KF Particle Finder package), which provides estimation of not only the tracking parameters themselves but also the corresponding covariance matrix as well. By using such additional information in the D0 reconstruction, the signal significance is improved considerably. The D0 and D0 meson v1 and their difference will be presented as a function of rapidity and pT, and compared with the results for light-flavor hadrons. These results will also be compared to model predictions and physics implications will be discussed.

Author

Xinyue Ju (University of Science and Technology of China)

Presentation materials