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    Feynman Diagrams for Beginners - arXiv.org

    • For constructing the Dirac current we need the equation for Hermitian adjoint of the Dirac equation we get (x)y. By taking the See more

    2.3 Free-particle solutions of the Dirac equation

    Since we are preparing ourselves for the perturbation theory calculations, we need to … See more

    arXiv.org
    Feynman diagrams.

    Before we turn to describing the method of Feynman diagrams, let us just specify other quantum fields that take part in the elementary particle physics inter-actions. All these ar… See more

    arXiv.org
    X (p; ) (p; )

    Hint: Write it in the most general form (Ag + Bp p ) and then determine A and B. The obtained result obviously cannot be simply extrapolated to the massless case via the limit m ! 0. … See more

    arXiv.org
    6.6 Summary of steps

    To recapitulate, calculating (unpolarized) scattering cross-section (or decay width) consists of the following steps: drawing the Feynman diagram(s) writing iM using the Feynman r… See more

    arXiv.org
    How do you calculate a Feynman diagram?
    There are several computer programs that can perform some or all of the steps in the calculation of Feynman diagrams. Here is one simple session with one of such programs, FeynCalcfor Wolfram’s Mathematica, where we calculate the same process, e e+! +, that we just calculated by hand.
    physics.gmu.edu
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