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We present a simple version of hadron-quark hybrid (HQH) model in the$\mu_B$--$T$ plain, where $T$ is temperature and $\mu_{B}$ is the baryon-numberchemical potential. The model is composed of the independent-quark model forquark-gluon states and an improved version of excluded-volume hadron resonancegas (EV-HRG) model for hadronic states. In the improved version of EV-HRG, thepressure has charge conjugation and is obtained by a simple analytic form. Theswitching function from hadron states to quark-gluon states in the presentmodel has no chemical potential dependence. The simple HQH model is successfulin reproducing LQCD results on the transition region of chiral crossover andthe EoS in $\mu_{B} \leq 400$ MeV. We then predict the chiral-crossover regionin $400 \leq \mu_{B} \leq 800$ MeV. We also predict a transition line derivedfrom isentropic trajectories in $0 \leq \mu_{B} \leq 800$ MeV and find that theeffect of strangeness neutrality is small there.

A hadron-quark hybrid model reliable for the EoS in $\mu_{B} \leq 400$ MeV