Generating Function of single-centered Black Hole Index in CHL Models

We present the construction of the generating function of single-centered black hole index in general ${\mathbb{Z}}_N$ CHL models. This is done by subtracting from the index of quarter BPS dyons, described by a meromorphic Siegel modular form, the generating function for the index of two-centered black holes. We use black hole bound state metamorphosis in CHL models for the construction of the generating function of two-centered black hole index. We prove the convergence of the generating function for the cases $N=2,3$.