Resonant and nonresonant effects in photon-technipion production at lepton colliders

Lepton collider experiments can search for light technipions in final states made striking by the presence of an energetic photon: e⁺e^-→γΠT. To date, searches have focused on either production through anomalous coupling of the technipions to electroweak gauge bosons or on production through a technivector meson (ρT,ωT) resonance. This paper creates a combined framework in which both contributions are included. This will allow stronger and more accurate limits on technipion production to be set using existing data from CERN LEP or future data from a higher-energy linear collider. We provide explicit formulas and sample calculations (analytic and PYTHIA) in the framework of the technicolor straw man model, a model that includes light technihadrons.