Speaker
Description
Beam energy dependence provides a unique probe of the evolution of collective dynamics and the transport properties of the quark–gluon plasma (QGP). A newly proposed observable, the transverse momentum–differential fluctuations of radial flow $v_{0}(p_{T})$, is measured for the first time at RHIC across a broad range of collision energies, covering the top RHIC energy and the Beam Energy Scan (BES) program. This measurement systematically constrains how radial flow fluctuations develop with changing energy density and lifetime of the medium, complementing high-energy LHC results.
In this work, we present measurements of $v_{0}(p_{T})$ for a variety of identified hadrons, $\pi^{\pm}$, $K^{\pm}$, $K^0_{S}$, $p$, $\bar{p}$, $\phi$, $\Lambda$, $\bar{\Lambda}$, and $\Xi^{\pm}$, in Au+Au collisions at $\sqrt{s_{NN}}=$ 11.5-200 GeV with the STAR experiment at RHIC. To explore how collective expansion evolves across these energies, we investigate the mass ordering of $v_{0}(p_{T})$ and test the number-of-constituent-quark (NCQ) scaling as a probe of partonic collectivity. The beam-energy dependence of $v_{0}(p_{T})$ is then studied to track the development of radial flow fluctuations from the top RHIC energy down through the BES region, offering new insights into the QCD phase structure.
| 请选择分会 | 高能重离子物理 |
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