B̄–B mixing constrains topcolor-assisted technicolor
نویسندگان
چکیده
منابع مشابه
B̄–B Mixing Constrains Topcolor–Assisted Technicolor
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%. bu...
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A condensate, tt, arising from O(TeV ) scale “topcolor,” in addition to technicolor (and ETC) may naturally explain the gauge hierarchy, the large top quark mass, and contains a rich system of testable consequences. A triplet of strongly coupled pseudo–Nambu–Goldstone bosons, “toppions,” near the top mass scale is a generic prediction of the models. A new class of technicolor schemes and associ...
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We consider the lepton-flavor violating(LFV) processes li → ljγ in the framework of topcolor assisted technicolor(TC2) models. We find that the new gauge boson Z ′ predicted by TC2 models can give significantly contributions to these processes via the flavor changing couplings. The present experimental bound on the LFV process μ → eγ gives severe constraints on the TC2 models. In the case that ...
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I present a model of topcolor-assisted technicolor that can have topcolor breaking of the desired pattern, hard masses for all quarks and leptons, mixing among the heavy and light generations, and explicit breaking of all technifermion chiral symmetries except electroweak SU(2)⊗U(1). These positive features depend on the outcome of vacuum alignment. The main flaw in this model is tau-lepton con...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 2001
ISSN: 0370-2693
DOI: 10.1016/s0370-2693(01)00587-1