Abstract
Before embarking on a detailed discussion of QCD perturbation theory it is worth recalling the main reasons for taking QCD seriously which are:1
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1.
There is excellent evidence that hadrons are made of tricoloured quarks and that the force between them is vector in nature. This force must be colour dependent, otherwise there would be nine degenerate π mesons with different colours. The only renormalizable field theories with these properties are gauge theories based on SU(3) (i. e. QCD) or on SO(3).
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2.
QCD, but not theories based on SO(3), accounts qualitatively for the observed features of hadrons.
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References
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Smith, C.H.L. (1983). An Introduction to Perturbative QCD. In: Capri, A.Z., Kamal, A.N. (eds) Particles and Fields 2. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-3593-1_2
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