Limits on pseudoscalar bosons from rare Z decays at LEP

Current LEP data on rare Z decays constrain nonminimal technicolor models that contain light neutral pseudo-Nambu-Goldstone boson (Pa). We discuss the production and decay of such particles, and show how LEP data on γγγ, γ+E̸ and γ+hadrons constrain the size of the technicolor gauge group and the strength of the ZγPa coupling. The limits are then applied to several specific technicolor scenarios.