Strange Hadron Production In A Quark Combination Model In Au Plus Au Collisions At Energies Available At The Bnl Relativistic Heavy Ion Collider

We apply a quark combination model to study yield densities and transverse momentum (p(T)) spectra of strange (anti)hadrons at midrapidity in central Au+Au collisions at root s(NN) = 7.7, 11.5, 19.6, 27, 39, and 200 GeV. We show that the experimental data for p(T) spectra of (anti)hadrons in these collisions can be systematically described by the equal velocity combination of constituent quarks and antiquarks at hadronization. We obtain the p(T) spectra of quarks and antiquarks at hadronization and study their collision energy dependence. We also reproduce the yield densities of hadrons and antihadrons. In particular, we demonstrate that the yield ratios of antihadrons to hadrons K-/K+, (p) over bar /p, (Lambda) over bar/Lambda, (Xi) over bar (+) /Xi(-), and (Omega) over bar (+) /Omega(-) simply correlate with each other and their experimental data except (Omega) over bar (+) /Omega(-) at root s(NN) = 7.7 GeV are systematically described by the model. These results suggest that the equal velocity combination mechanism for quarks and antiquarks at hadronization plays an important role for the production of these long-lived hadrons in Au+Au collisions at low RHIC energies (root s(NN) >= 11.5 GeV).