Neutral Pion-like Resonances at Photon Colliders
Abstract
Two photons can annihilate into a neutral pion-like resonance via the anomaly coupling, just like π0γγ in QCD. In some strongly interacting electroweak symmetry breaking models, e.g., technicolor type models, there often exist neutral pion-like resonances. TeV photon colliders have a strong capability to discover such particles, because the standard model background in photon scattering goes through box diagrams and is therefore highly suppressed. In this study, we perform a signal-background comparison. We show that e+ e- linear colliders running in γγ mode can discover such neutral-pion-like resonances with a decent sensitivity.
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