Arbitrary superspin massive superparticles

We propose an exactly solvable model for a massive N-extended superparticle with pure (half-)integer superspin Y, Y = 0,12, 1, 32, ... Regardless of the superspinvalue, the configuration space is 4|4N × S2, where S2 corresponds to spinning degrees of freedom. Being explicitly super-Poincaré invariant, the model possesses two gauge symmetries implying strong conservation of the squared momentum and superspin. Hamilton constrained dynamics is developed and canomical quantization is studied. For N = 1 we show that the physical super wave-functions are to be on-shell massive chiral superfields. Central-charge and higher-dimensional generalizations of the model are given.