Spinorial Characterization of CR Structures, I

We characterize certain CR structures of arbitrary codimension (different from 3, 4 and 5) on Riemannian Spin${}^c$ manifolds by the existence of a Spin${}^c$ structure carrying a strictly partially pure spinor field. Furthermore, we study the geometry of Riemannian Spin${}^c$ manifolds carrying a strictly partially pure spinor which satisfies the generalized Killing equation in prescribed directions.