Anti-B-B Mixing Constrains Topcolor-Assisted Technicolor
Gustavo Burdman, Kenneth Lane, Tonguc Rador
Abstract
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 anti-Bd--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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