Heavy quark flow as better probes of QGP properties
Key Laboratory of Quarks and Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University, Wuhan 430079, China
2 Department of Physics, East Carolina University, Greenville, North Carolina 27858, USA
3 College of Science, Wuhan University of Science and Technology, Wuhan, Hubei 430065, China
4 Department of Physics and Astronomy, Purdue University, West Lafayette, IN 47907, USA
5 School of Science, Huzhou University, Huzhou, Zhejiang 313000, China
Published online: 2 February 2018
In earlier studies we have proposed that most parton v2 comes from the anisotropic escape of partons, not from the hydrodynamic flow, even for semi-central Au+Au collisions at = 200 GeV. Here we study the flavor dependence of this escape mechanism with a multi-phase transport model. In contrast to naive expectations, we find that the charm v2 is much more sensitive to the hydrodynamic flow than the lighter quark v2, and the fraction of v2 from the escape mechanism decreases strongly with the quark mass for large collision systems. We also find that the light quark collective flow is essential for the charm quark v2. Our finding thus suggests that heavy quark flows are better probes of the quark-gluon-plasma properties than light quark flows.
© The Authors, published by EDP Sciences, 2018
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