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PHENOMENOLOGY OF COMPLEX SPIN TACHYONS.

A preliminary formulation of a phenomenology of negative mass squared resonances (NMSR) is described. The angular distribution of pion-nucleon charge exchange scattering is interpreted L'1 terms of these objects. Negative mass squared resonances have as their spin projection operator a menlber of the principal series j = _.~ + i a of irreducible representation of the little group 0(2, 1). A fit or the experimental data for laboratory momenta from 5.9 to 18.2 GeV/c requires a NMSR with -m2 = 1.0 (GeV/c)2, a total widthr= 0.3 GeVand a= 1.1.