•Generation of topologies and insertion of fields

Construction of topologies:

mesonstop = CreateTopologies[0, 2 -> 2, Adjacencies -> {4}, ExcludeTopologies -> {SelfEnergies, WFCorrections}, CountertermOrder -> 0] ;

Field insertion:

mesontreeinsert = InsertFields[mesonstop, {PhiMeson[0, {i1}], PhiMeson[0, {i2}]} -> {PhiMeson[0, {i3}], PhiMeson[0, {i4}]}, Model -> "Automatic", GenericModel -> "Automatic", InsertionLevel -> Classes] ;

Graphical representation of the process:

Paint[mesontreeinsert, PaintLevel -> {Classes}, AutoEdit -> False, SheetHeader -> False, Numbering -> False, ColumnsXRows -> {2, 1}] ;

[Graphics:../HTMLFiles/index_25.gif]

Converted by Mathematica  (July 10, 2003)