Has a Heavy New Pseudoscalar Been Detected?

Abstract

I speculate that heavy (≃ 93 GeV) pseudoscalar decays are responsible for the radiative $e^{+}{e}^{-}\gamma$, ${\mu }^{+}{\mu }^{-}\gamma$, and missing-energy + $\gamma$ events observed at the CERN $\bar{p}p$ collider. Decay signatures and the production cross section of this new particle are analyzed. For a consistent scenario, it seems that this pseudoscalar must be the partner of a "composite" $Z$ boson.