•The FeynArts model "Automatic"

The model files "Automatic.gen" and "Automatic.mod" should be put in the FeynArts directory "Models", but should be considered a part of PHI, or more precisely, they are files that automatically generate model definitions for FeynArts from PHI (FeynCalc) input.  Below is a listing of some of the FeynArts objects, definitions for which are generated by "Automatic.gen" and "Automatic.mod".  If FeynArts generates an error message when using the model "Automatic", it is most probably due to a wrong or missing setting of one or more of the $-objects of PHI (usually set at the bottom of the configutation file for the PHI model in question).  However, to track down the error (or bug in PHI, "Automatic.mod" or "Automatic.gen"), it may be usefull to check that after initializing the model "Automatic" with some setting of $VerticesSpecifications (see some of the longer examples), the objects listed below look as they should.

The output below followed after initializing the model "Automatic" with $Configuration="ChPT2" and $Lagrangians={"ChPT2"[2],"ChPT2"[4]}.

M$GenericPropagators

{PV(( FADiracSpinor (-mom, Mass (Fermion20 (i))) )) == ( FADiracSpinor (-mom, Mass (Fermion20 (i))) ), PV(i (( FADiracSlash (-mom) + Mass (Fermion20 (i)) )) FAPropagatorDenominator (mom, Mass (Fermion20 (i)))) == i (( FADiracSlash (-mom) + Mass (Fermion20 (i)) )) FAPropagatorDenominator (mom, Mass (Fermion20 (i))), PV (1) == 1, PV (i FAPropagatorDenominator (p, Mass (PseudoScalar2 (i)))) == i FAPropagatorDenominator (p, Mass (PseudoScalar2 (i)))}

M$GenericCouplings

{AnalyticalCoupling(s1 Fermion20(nr1, p _ 1), s2 Fermion20(nr2, p _ 2), s3 PseudoScalar2(nr3, p _ 3)) == (G (1)) (s1 Fermion20 (nr1), s2 Fermion20 (nr2), s3 PseudoScalar2 (nr3)) {(( FADiracMatrix(p _ 3) )) g _ A^( )}}

M$ClassesDescription

{Fermion20 (0) == {SelfConjugate -> False, FAIndices -> {Index (IsoSpin (J))}, Mass -> m _ N^( ), PropagatorLabel -> ComposedChar ({N, Index (IsoSpin (J))}), PropagatorType -> Dashing[0.003`, 0.006`], PropagatorArrow -> Forward}, PseudoScalar2 (0) == {SelfConjugate -> True, FAIndices -> {Index (IsoSpin (i))}, Mass -> m _ π^( ), PropagatorLabel -> ComposedChar ({π, Index (IsoSpin (i))}), PropagatorType -> Straight, PropagatorArrow -> None}}

?? IndexRange

IndexRange[i] gives a list of possible values of index i.

IndexRange[Index[IsoSpin[I]]] = {1, 2, 3} <br /> <br /> IndexRange[Index[IsoSpin[II]]] = {1, 2, 3} <br /> <br /> IndexRange[Index[IsoSpin[J]]] = {1, 2} <br /> <br /> IndexRange[HighEnergyPhysics`FeynArts`Initialize`error_] := (Message[InitializeModel :: norange, HighEnergyPhysics`FeynArts`Initialize`error] ; $Aborted)

M$CouplingMatrices

{C[-Fermion20(0, {J _ 1}), Fermion20(0, {J _ 2}), PseudoScalar2(0, {I _ 3})] == {{-(σ(I _ 3, GaugeGroup -> 2))(J _ 1, J _ 2)/(2 f _ π^( ))}}}

Converted by Mathematica  (July 10, 2003)