Detecting Toppion via a Flavor－Changing Single Top Quark Production Process

In the framework of topcolor-assisted technicolor (TC2) theory, we study a flavor changing single top quark production process at upgraded Tevatron and LHC. The results show that with the flavor changing coupling of neutral toppion to top and charm quark, toppion provides a large -channel resonance effect. The signal of single top production could be detected at LHC. Otherwise, the narrow peak in the invariant mass distribution could be clearly detected both at upgraded Tevatron and LHC. Therefore, such single top production process provides a unique way to test TC2 model via the detection of -channel neutral toppion contribution.