FeynRule

Description

FeynRule[lag, {fields}] derives the Feynman rule corresponding to the field configuration fields of the lagrangian lag.

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FeynRule does not calculate propagator Feynman rules.

The option ZeroMomentumInsertion can be used for twist-2 and higher twist operators.

See also: Lagrangian.

Examples
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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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The FeynCalc Book   previousFeynCalcInternal   nextFieldStrength

Converted from the Mathematica notebook FeynRule.nb