科研之友
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摘要
The top-pions (pi(0,+/-)(t)) are the three additional typical particles predicted by the topcolor-assisted technicolor (TC2) model and the observation of these particles can be regarded as the direct evidence of the TC2 model. In this paper, we investigate the production of a pair of charged top-pions associated with Z gauge boson at the International Linear Collider (ILC), i.e e(+)e(-) -> Z pi(+)(t)pi(-)(t) and gamma gamma -> Z pi(+)(t)pi(-)(t). We calculate the production rate of the process e(+)e(-) -> Z pi(+)(t)pi(-)(t) and present the distributions of the transverse momenta of Z gauge boson and charged top-pion pi(+)(t). We find that the cross-section of the process e(+)e(-) -> Z pi(+)(t)pi(-)(t) can reach 1 fb with reasonable parameter space of the TC2 model. Considering the main decay mode of charged top-pion, we find that such a production may provide copious events. While the cross-section of the process gamma gamma -> Z pi(+)(t)pi(-)(t) is below 1 fb, hence the process e(+)e(-) -> Z pi(+)(t)pi(-)(t) will play an important role in the test of the TC2 model at the ILC when compared with the process gamma gamma -> Z pi(+)(t)pi(-)(t).
