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Physical Review C
We present the first spin alignment measurements for the K^*0(892) and ϕ(1020) vector mesons produced at mid-rapidity with transverse momenta up to 5 GeV/c at √(s_NN) = 200 GeV at RHIC. The diagonal spin density matrix elements with respect to the reaction plane in Au+Au collisions are ρ_00 = 0.32 ± 0.04 (stat) ± 0.09 (syst) for the K^*0 (0.8<p_T<5.0 GeV/c) and ρ_00 = 0.34 ± 0.02 (stat) ± 0.03 (syst) for the ϕ (0.4<p_T<5.0 GeV/c), and are constant with transverse momentum and collisiondoi:10.1103/physrevc.77.061902 fatcat:rr2jvdads5ferbfwphfyyw6ete