(B)over-bar-B mixing constrains topcolor-assisted technicolor
Lane, Kenneth D.
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Citation (published version)G. Burdman, K. Lane, T. Rador. 2001. "(B)over-bar-B mixing constrains topcolor-assisted technicolor." PHYSICS LETTERS B, Volume 514, Issue 1-2, pp. 41 - 46 (6). https://doi.org/10.1016/S0370-2693(01)00587-1
We argue that extended technicolor augmented with topcolor requires that all mixing between the third and the first two quark generations resides in the mixing matrix of left-handed down quarks. Then, the B̄d – Bd mixing that occurs in topcolor models constrains the coloron and Z′ boson masses to be greater than about 5 TeV. This implies fine tuning of the topcolor couplings to better than 1%.
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