Light gluino mass and condensate from properties of η and η′

We investigate whether known properties of the η′ meson are consistent with its being the Goldstone boson of the spontaneously broken anomaly-free R symmetry required in the light gluino scenario. We fit the masses and 2γ decays of the η and η′ mesons, and also their production in radiative Jψ decays. We find that the η - η′ system is well-described in the light gluino scenario, if mλ ⋍ (84–144) MeV and 〈λλ〉 ⋍ −(0.15–0.36) GeV3. These values are in the range expected when the gluino gets its mass entirely from radiative corrections.