Entropy per Baryon in Strong Coupling QCD

The entropy per baryon is studied in the strong coupling large dimension $d$ limit of lattice QCD with staggered fermions. The partition function is calculated for non-zero chemical potential and temperature using the $1/d$ expansion. It is found that the entropy per baryon ratio is almost continuous across the transition from the the quark-gluon to the hadronic phase. The relevance of these results for heavy ion collisions is discussed.