STAR D 0 meson υ2 measurement

32nd Winter Workshop on Nuclear Dynamics

He, Liang^1

Department of Physics and Astronomy, Purdue University, West Lafayette

IN

47907, United States^1

关键词: Au+Au collisions;    Collective behavior;    Elliptic flows;    Nuclear modification factors;    Quark-gluon plasma;    Relativistic Heavy Ion Collider;    Theoretical calculations;    Transverse momenta;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/736/1/012007/pdf
DOI  :  10.1088/1742-6596/736/1/012007

来源: IOP

【 摘 要 】

Experiments at the Relativistic Heavy Ion Collider (RHIC) indicate that a novel QCD matter consistent with a strongly-coupled Quark-Gluon Plasma (sQGP) has been created. Heavy quarks are predominantly created in initial hard scatterings, and thus experience the entire evolution of the system including the sQGP phase. The sensitivity of heavy quarks to the transport properties of sQGP is encoded in experimental observables such as elliptic flow (υ2). In this presentation, we present the first measurement of υ2of D0mesons reconstructed with the STAR Heavy Flavor Tracker (HFT) in Au+Au collisions at √sNN=200 GeV, for a wide transverse momentum range. The measured D0υ2in 0-80% most central collisions is finite and suggests that the charm quark exhibits collective behavior. Several theoretical calculations with dimensionless spacial diffusion coefficient (2πTDs) for charm quarks in the range of ∼2-12 can simultaneously reproduce our D0υ2result as well as the previously published D0nuclear modification factor.