Top-pions and single top production at the HERA and THERA colliders Original Research Article

The presence of physical top-pions in low-energy spectrum is an inevitable feature of topcolor scenario. We consider the contributions of the physical top-pions predicted by topcolor-assisted technicolor (TC2) models to the single top production via the t-channel process eq→et at the HERA and THERA colliders. We find that the neutral top-pion can generate large contributions to the process ec→et. In most of the parameter space, the production cross section is in the range of 1–6 pb. The signals and observability of the neutral top-pion can be studied in the HERA and THERA colliders.