Colourless Mesons in a Polychromatic World
نویسنده
چکیده
The limit of an infinite number of quark colours turns out to be a very useful starting point to understand many features of the strong interaction. The SU(NC) gauge theory simplifies considerably at NC →∞, while keeping the most essential properties of QCD. Choosing the coupling constant gs to be of O ( 1/ √ NC ) , i.e., taking the large–NC limit with αsNC fixed, there exists a systematic expansion in powers of 1/NC , which for NC = 3 provides a good quantitative approximation scheme to the hadronic world. The combinatorics of Feynman diagrams at large NC results in simple counting rules, which characterize the 1/NC expansion:
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