Detecting the neutral top-pion at e+e- colliders -: art. no. 055002

We investigate some processes of the associated production of a neutral top-pion Pi(t)(0) with a pair of fermions (e(+)e(-)-->f (f) over bar Pi(t)(0)) in the context of top-color-assisted technicolor (TC2) theory in the future e(+)e(-) colliders. The studies show that the largest cross sections of the processes e(+)e(-)-->f(')'(f) over bar'Pi(t)(0) (f(')=u,d,c,s,mu,tau) could only reach the level of 0.01 fb; we can hardly detect a neutral top-pion through these processes. For the processes e(+)e(-)-->e(+)e(-)Pi(t)(0), e(+)e(-)-->t (t) over bar Pi(t)(0), and e(+)e(-)-->b (b) over bar Pi(t)(0), the cross sections of these processes are at the level of a few fb for the favorable parameters, and a few tens, even hundreds, of neutral top-pion events can be produced at future e(+)e(-) colliders each year through these processes. With the clean background of the flavor-changing t (c) over bar channel, the top-pion events can possibly be detected at the planned high luminosity e(+)e(-) colliders. Therefore, such neutral top-pion production processes provide a useful way to detect a neutral top-pion and test the TC2 model directly.