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QUANTUM CHROMODYNAMICS
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These lectures provide an overview of Quantum Chromodynamics (QCD), the $SU(3)_C$ gauge theory of the strong interactions. After briefly reviewing the empirical considerations which lead to the introduction of {\it colour}, the QCD Lagrangian is discussed. The running of the strong coupling and the associated property of {\it Asymptotic Freedom} are analyzed. Some selected experimental tests and the present knowledge of $\alpha_s$ are summarized. A short description of the QCD flavour symmetries and the {\it dynamical breaking of chiral symmetry} is also given.
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Internal structure of light mesons using the power law wave function
Spin-improved power-law wave functions yield 41% valence quark momentum fraction at 16 GeV² for pion and kaon, with vector form factors agreeing with experiment and charge radii of 0.668 fm and 0.704 fm.
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