Charge asymmetry dependence of π/K anisotropic flow in Au+Au and U+U collisions at RHIC

Elliptic (v₂) and triangular (v₃) flow of charged pions (π) and v₂ of kaons (K) at low transverse momenta (0.15T<0.5GeV/c) are studied as a function of event charge asymmetry (A_ch) in Au+Au collisions at √(s_NN)=200GeV and U+U collisions at √(s_NN)=193GeV recorded by the STAR experiment at RHIC. The slope of the difference between negatively and positively charged pion v₂ and v₃ (Δv₂ and Δv₃) as a function of A_ch is extracted for different centrality intervals. Comparison between the slope of Δv₂(A_ch) and Δv₃(A_ch) suggests that it is unlikely dominated by effects of local charge conservation at freeze-out. Our results provide new constraints on backgrounds in the search for effects of the chiral magnetic wave in heavy-ion collisions