FEYN CALC SYMBOL

FeynRule


derives the Feynman rule corresponding to the field configuration fields of the lagrangian lag. FeynRule does not calculate propagator Feynman rules. The option ZeroMomentumInsertion can be used for twist-2 and higher twist operators.

ExamplesExamplesopen allclose all

Basic Examples  (1)Basic Examples  (1)

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2-gluon Feynman rules (unpolarized)
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2-gluon Feynman rules (polarized)
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Compare with the Feynman rule tabulated in Twist2GluonOperator.
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quark-quark Feynman rule (unpolarized)
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quark-quark -gluon-gluon Feynman rule (unpolarized)
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In general equality can be shown by Timing[Factor2[ FCE[Calc[ChangeDimension[FCE[OPESumExplicit[n4-t4]],4]/.s-p-q-r]]]] but it is a little bit slow ...
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QCD vertices
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