Single Charged Top-Pion Production at the Next Generatione+e− Colliders

Abstract

The single charged top-pion production processese+e−→tb̄Πt− and e+e−→W+Πt− are studied in the framework of top-color-assistedtechnicolor (TC2) model. Our studies show that the cross sectionσ(e+e−→tb̄Πt−) reaches the level oftens of fb and σ(e+e−→W+Πt−) reaches thelevel of a few fb. With the yearly integrated luminosity of£∼500 fb−1 expected at the planned colliders, onecould collect thousands of charged top-pion of events via the processe+e−→tb̄Πt− and hundreds of events via theprocess e+e−→W+Πt−. The flavor changing decaymode Π−t→bc̄ is the best channel to detectcharged top-pion due to the clean SM background. With a largenumber of events and the clean background, the charged top-pionshould be observable at the planned colliders. Therefore, ourstudies in this paper can help us to search for charged top-pion,and furthermore, to test the TC2 model.