QCD Feynman Rules
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چکیده
where i denotes the color of a quark and f its flavor. DμΨ i = ∂μΨ i + igAμ(t )jΨ j where t are matrices representing the gauge group generators in the quark representation; in QCD the quarks belong to the fundamental 3 representation of the SU(3)C so t a is 1 2 ×Gell-Mann matrix λ. The Quantum ChromoDynamics is more complicated, even at the Lagrangian level: including the gauge-fixing and the ghost terms as well as the counterterms, we have L = − 4 (F a μν) 2 − 1 2ξ (∂μA ) + ∂μc̄ Dc + ∑
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