Charge asymmetry dependency of π/K anisotropic flow in U+U = 193 GeV and Au+Au = 200 GeV collisions at STAR

14th International Conference on Strangeness in Quark Matter

Shou, Qi-Ye^1,2

Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, China^1

Brookhaven National Laboratory, Upton, NY, United States^2

关键词: Anisotropic flows;    Au+Au collisions;    Charge asymmetries;    Consistency checks;    Magnetic waves;    Measurements of;    Slope parameter;    Transverse momenta;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/509/1/012033/pdf
DOI  :  10.1088/1742-6596/509/1/012033

来源: IOP

【 摘 要 】

In this paper we present STAR's measurements of v2and v3for charged kaons and pions at low transverse momentum range (0.15 Tch) in both U+U collisions at 193 GeV and Au+Au collisions at 200 GeV. We found that in 20%-60% centrality, the ratio of slope parameters of Δv3(Ach) to that of Δv2(Ach), is +3σ below the predicted value (1/3) from local charge conservation at freeze-out, indicating that it is unlikely that such effect can have a significant contribution to the splitting of elliptic flow of charged pions as a function of Ach. We also observed a smaller Δv2(Ach) slope for kaons relative to pions. Our measurements serve as important consistency checks for the phenomena suggested as the consequence of the chiral magnetic wave.