Rare Z-decay into light pseudoscalar bosons in the simplest little Higgs model Original Research Article

The simplest little Higgs model predicts a light pseudoscalar boson η and opens up some new decay modes for Z-boson, such as image, image, image and image. We examine these decay modes in the parameter space allowed by current experiments, and find that the branching ratios can reach image for image, image for image, and image for image, which should be accessible at the GigaZ option of the ILC. However, the branching ratios can reach image for image, and image for image, which are hardly accessible at the GigaZ option.