Limits on Pseudoscalar Bosons From Rare $Z$ Decays at LEP
arXiv:hep-ph/9507438 · doi:10.1016/0370-2693(95)01152-G
Abstract
Current LEP data on rare $Z$ decays constrain nonminimal technicolor models that contain light neutral pseudo-Nambu-Goldstone bosons ($P^a$). We discuss the production and decay of such particles, and show how LEP data on $γγγ$, $γ+ E\!\!\!/ $ and $γ+$hadrons constrain the size of the technicolor gauge group and the strength of the $ZγP^a$ coupling. The limits are then applied to several specific technicolor scenarios.
13 pages, harvmac and epsf, 3 figures. Full postscript version including figures available at http://smyrd.bu.edu/htfigs/htfigs.html