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Corrections to the Zτ +τ− vertex in topcolor-assisted technicolor theory |
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| Authors: | Chong-Xing Yue Yu-Ping Kuang Gong-Ru Lu |
| Institution: | 1. CCAST (World Laboratory), P.O. Box 8730, 100080, Beijing, China 2. Physics Department, Henan Normal University, Xin Xiang, 453002, Henan, People’s Republic of China 3. Institute of Modern Physics, Tsinghua University, 100084, Beijing, People’s Republic of China |
| Abstract: | We calculate the corrections to the Zτ+τ? vertex in the one-family topcolor-assisted technicolor models without exact custodial symmetry contributed from the exchange of extended technicolor (ETC) sideways and diagonal gauge bosons and the topcolor gauge boson Z′. The precise measurements of the τ asymmetry parameter Aτ give strong constraint on the free parameters in the topcolor-assisted technicolor models. |
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