A CLASS OF CHIRAL FERMION MODELS

We study the relation between the Roma and Zaragoza proposals for chir al fermions on the lattice. The fermion action in the Roma approach is shown to be equivalent to the one of the Zaragoza type. This result i s used to perform a mean-field study of the phase diagram for chiral Y ukawa models based on the Roma action. The phase diagram is compared w ith the one based on the Zaragoza model with the most local choice for the fermion interactions.