Viscous hydrodynamics description of ϕ meson production in Au+Au and Cu+Cu collisions

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In the Israel-Stewart's theory of 2nd order dissipative hydrodynamics, we have simulated ϕ production in Au+Au and Cu+Cu collisions at √sNN=200 GeV. Evolution of QGP fluid with viscosity over the entropy ratio η/s=0.25, thermalised at τᵢ=0.2 fm, with initial energy density εᵢ=5.1 GeV/fm³ explains the experimental data on ϕ multiplicity, integrated v₂, mean pₜ, pₜ spectra and elliptic flow in central and mid-central Au+Au collisions. η/s=0.25 is also consistent with centrality dependence of ϕ pₜ spectra in Cu+Cu collisions. The central energy density in Cu+Cu collisions is εᵢ=3.48 GeV/fm³.