Top-quark FCNC decay t{yields}cgg in topcolor-assisted technicolor model
- Department of Physics, Henan Normal University, Xinxiang, Henan 453007 (China)
The topcolor-assisted technicolor (TC2) model predicts several pseudoscalars called top-pions and at loop level they can induce the flavor-changing neutral-current (FCNC) top-quark decay t{yields}cgg which is extremely suppressed in the standard model (SM). We find that in the allowed parameter space the TC2 model can greatly enhance such a FCNC decay and push the branching ratio up to 10{sup -3}, which is much larger than the predictions in the SM (10{sup -9}) and in the minimal supersymmetric model (10{sup -4}). We also compare the result with the two-body FCNC decay t{yields}cg and find that the branching ratio of t{yields}cgg is at the same order as t{yields}cg. Such enhanced FCNC top-quark decays may serve as a good probe of the TC2 model at the future top-quark factory.
- OSTI ID:
- 21249762
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 77, Issue 5; Other Information: DOI: 10.1103/PhysRevD.77.057501; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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