Composite scalars at CERN LEP: Constraining technicolor theories

CERN LEP I and LEP II data can be used to constrain technicolor models with light, neutral pseudo– Nambu-Goldstone bosons $P^a.$ We use published limits on branching ratios and cross sections for final states with photons, large missing energy, jet pairs, or $b\overline{b}$ pairs to constrain the anomalous $P^a{Z}^0{Z}^0,$ $P^a{Z}^0\gamma ,$ and $P^a\gamma \gamma$ couplings. From these results, we derive bounds on the size of the technicolor gauge group and the number of technifermion doublets in models such as low-scale technicolor.