As shown in Fig. 15.15, the energy point ≃ 1 GeV separates the QCD scale into regions of large and small running coupling α s (μ), or equivalently, of low and high energy, or light and heavy particles. The world of heavy flavors begins with the charm quark and the τ lepton and extends to the bottom and top quarks in the fermionic sector. The list of heavy particles in the standard model also includes the weak bosons W± and Z0, and the neutral Higgs boson. Of these, only the Higgs boson is still not experimentally observed at present.
KeywordsForm Factor Heavy Quark Semileptonic Decay Heavy Flavor Heavy Quark Effective Theory
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Suggestions for Further Reading
QCD corrections to weak interaction, operator product expansion
Heavy flavor symmetry
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