A lower bound of 5.4×${10}^{-16\mathrm{}}$ is shown to follow on the gravitino-photino mass ratio from the observed lack of occurrence of the processes $e^{+}{e}^{-}\to \gamma S$, $\gamma P$, where $S$ and $P$ are the nearly massless chiral scalar and pseudoscalar, respectively. For a large class of theories with unified gaugino masses, this is convertible into a lower limit of 6.5×${10}^{-15\mathrm{}}$ GeV on the gravitino mass.

• Received 5 March 1990

DOI:https://doi.org/10.1103/PhysRevD.42.938