Phase diagram of the Wako-Saito-Munoz-Eaton beta-hairpin Model obtained with partition function zeros

I study the partition function zeros of the Wako-Saito-Munoz-Eaton (WSME) beta hairpin model in the complex temperature plane. For various values of the entropy cost of disordering a bond, the zeros show clear locus corresponding to the folding transition. By extrapolating the locus to the real axis, transition temperature can be determined for various values of the entropy cost, leading to the phase diagram of the WSME beta hairpin model.