Editing Top quark condensate (section)

==History==
The idea was described by [[Yoichiro Nambu]]{{citation needed|date=May 2020}} and subsequently developed by Miransky, Tanabashi, and Yamawaki (1989)<ref>{{cite journal |last1=Miransky |first1=V.A. |last2=Tanabashi |first2=Masaharu |last3=Yamawaki |first3=Koichi |title=Dynamical electroweak symmetry breaking with large anomalous dimension and t quark condensate |journal=Physics Letters B |publisher=Elsevier BV |volume=221 |issue=2 |year=1989 |issn=0370-2693 |doi=10.1016/0370-2693(89)91494-9 |pages=177–183 |bibcode=1989PhLB..221..177M}}</ref><ref>{{cite journal |last1=Miransky |first1=V.A. |last2=Tanabashi |first2=Masaharu |last3=Yamawaki |first3=Koichi |title=Is the t Quark Responsible for the Mass of W and Z Bosons? |journal=Modern Physics Letters A |publisher=World Scientific |volume=04 |issue=11 |pages=1043–1053 |date=1989-06-10 |df=dmy-all |issn=0217-7323 |doi=10.1142/s0217732389001210 |bibcode=1989MPLA....4.1043M}}</ref> and [[William A. Bardeen]], [[Christopher T. Hill]], and [[Manfred Lindner]] (1990),<ref>{{cite journal |author1=Bardeen, William A. |author2=Hill, Christopher T. |author3=Lindner, Manfred |name-list-style=amp |year=1990 |title=Minimal dynamical symmetry breaking of the standard model |journal=Physical Review D |volume=41 |issue=5 |pages=1647–1660 |doi=10.1103/PhysRevD.41.1647 |bibcode=1990PhRvD..41.1647B |pmid=10012522}}</ref> who connected the theory to the [[renormalization group]], and improved its predictions.

The renormalization group reveals that top quark condensation is fundamentally based upon the ''[[infrared fixed point]]'' for the top quark Higgs-Yukawa coupling, proposed by Pendleton and Ross (1981)<ref>{{cite journal |last1=Pendleton |first1=B. |last2=Ross |first2=G.G. |title=Mass and mixing angle predictions from infra-red fixed points |journal=Physics Letters B |publisher=Elsevier BV |volume=98 |issue=4 |pages=291–294 |year=1981 |issn=0370-2693 |doi=10.1016/0370-2693(81)90017-4|bibcode=1981PhLB...98..291P }}</ref> and Hill.<ref>{{cite journal |last1=Hill |first1=C.T. |title=Quark and Lepton masses from Renormalization group fixed points |journal=Physical Review D |year=1981 |volume=24 |issue=3 |page=691 |doi=10.1103/PhysRevD.24.691 |bibcode=1981PhRvD..24..691H}}</ref> The "infrared" fixed point originally predicted that the top quark would be heavy, contrary to the prevailing view of the early 1980s. Indeed, the [[top quark]] was discovered in 1995 at the large mass of 174&nbsp;GeV. The infrared-fixed point implies that it is strongly coupled to the Higgs boson at very high energies, corresponding to the [[Landau pole]] of the Higgs-Yukawa coupling. At this high scale a bound-state Higgs forms, and in the "infrared", the coupling relaxes to its measured value of order unity by the [[renormalization group]]. The Standard Model [[renormalization group]] fixed point prediction is about 220&nbsp;GeV, and  the observed top mass is roughly 20% lower than this prediction. The simplest top condensation models are now ruled out by the [[Large Hadron Collider|LHC]] discovery of the Higgs boson at a mass scale of 125&nbsp;GeV. However, extended versions of the theory, introducing more particles, can be consistent with the observed top quark and Higgs boson masses.