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Collision centrality and energy dependence of strange hadron production in Au + Au collisions at \sqrt{s_{NN}}= 7.7-54.4 GeV

We apply an equal-velocity quark combination model to systematically study the transverse momentum (p_{T}) spectra of strange hadrons K_{S}^{0}, ϕ, Λ, Ξ^{-}, Ω^{-}, \barΛ, \barΞ^{+} and \barΩ^{+} at mid-rapidity in Au+Au collisions at \sqrt{s_{NN}}= 7.7, 11.5, 19.6, 27, 39, 54.4 GeV. Relative deviation between the model calculation and experimental data of these eight hadrons is generally about 2-3% at \sqrt{s_{NN}}= 27, 39, 54.4 GeV and in central collisions at 7.7, 11.5, 19.6 GeV. The deviation slightly increases up to about 4% in the semi-central and peripheral collision at \sqrt{s_{NN}}= 7.7, 11.5, 19.6 GeV. We systematically explain the dependence of two baryon-to-meson ratios \barΛ/K_{S}^{0} and Ω/ϕon p_{T}, collision centrality and collision energy by the property of quark p_{T} spectra at hadronization. We derive the analytic relations between R_{CP} of hadrons and those of quarks, and we use them to naturally explain the species and p_{T} dependence of R_{CP} of those strange hadrons.