The zero tension limit of the superstring

We construct the limit T→0 of the superstring starting from a reformulation of the same limit for the bosonic string. The resulting action is manifestly 2D-diffeomorphism invariant as well as Siegel-invariant. It is also invariant under superconformal transformations in the ambient superspace. The model describes a collection of superparticles moving on a supernull surface. We propose it as a high energy limit of the superstring. (orig.)