We propose an analogue of spin fields for the relativistic RNS-particle in 4
    dimensions, in order to describe Ramond-Ramond states as “two-particle”
    excitations on the world line. On a natural representation space we identify a
    differential whose cohomology agrees with RR-fields equations. We then discuss
    the non-linear theory encoded in deformations of the latter by background
    fields. We also formulate a sigma model for this spin field from which we
    recover the RNS-formulation by imposing suitable constraints.

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