Ω and ϕ production in Au + Au collisions at $\sqrt{s_{{}_{NN}}}=11.5$  and 7.7 GeV in a dynamical quark coalescence model

The Ω and ϕ production in relativistic heavy-ion collisions is studied in a dynamical quark coalescence model using the phase space information of strange quarks from a multiphase transport (AMPT) model. Enhanced local parton density fluctuation is implemented in the AMPT to simulate the QCD phase transition dynamics. By studying the transverse momentum $p_T$ spectra and the elliptic flow of the multi-strangeness particles, such as Ω and ϕ, and the $\Omega /\varphi$ ratio as a function of $p_T$ in the AMPT, we find that the new development improves the description of experimental data. The study motivates further experimental investigations of Ω and ϕ production in phase II of the Beam Energy Scan program at RHIC.