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Constraint on the photino mass from cosmology

A lower bound for the photino mass m/sub gamma-tilde/ as a function of the spin-0 fermion superpartner mass m/sub f/ is derived as an extension of the calculation of Lee and Weinberg. The Majorana nature of the photino induces a p-wave threshold for annihilation gamma-tildegamma-tilde..-->..ff-bar into light fermions, and leads to a rather unexpected form for the bound: for 25 GeV 45 GeV, (m/sub gamma-tilde/)/sub min/ increases approximately linearly with m/sub f/ to a value of 20 GeV when m/sub f/ = 100 GeV.