Burdman, GustavoLane, Kenneth D.Rador, Tonguç2020-04-062020-04-062001-08-09G. 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)00587-10370-2693https://hdl.handle.net/2144/40015We 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%.p. 41 - 46en-USCopyright © 2001 Elsevier Science B.V. All rights reserved.Science & technologyPhysical sciencesAstronomy & astrophysicsPhysics, nuclearPhysics, particles & fieldsFlavor-universal coloronsDirect CP violationSymmetry-breakingTop-quarkStandard modelCondensationDynamicsDecaysMassNuclear & particles physicsAtomic, molecular, nuclear, particle and plasma physicsAstronomical and space sciencesMathematical physicsArticle10.1016/S0370-2693(01)00587-10000-0001-8281-5438 (Lane, K)184657