Matchete provides functionality for automatically deriving Feynman rules and generating Universal Feynman Output files from a given Lagrangian.

Feynman Rules

FeynmanRules — get momentum space Feynman rules from a Lagrangian

Ext — denotes an external field in the Feynman rules

ExtMom — denotes an external momentum in the Feynman rules

Legs — option for controlling how many external legs should be considered when computing Feynman rules

Universal Feynman Output (UFO)

ExportUFO — generates the UFO interface files from a Lagrangian

DefaultParamCard — generates a JSON file template for the parameter card used to specify the values of all parameters for the UFO export

InputFile — option allowing to specify a path to a parameter card for the UFO export

OutputDirectory — option allowing to specify a directory where parameter cards or UFO files are saved

UFO — option for providing additional information, required for the UFO export, when defining fields, couplings, and gauge groups

Coupling Orders

DefineCouplingOrder — defines a new coupling order for the UFO export

GetCouplingOrders — returns an association containing all information about defined coupling orders

RemoveCouplingOrder — removes a single coupling order

ResetCouplingOrders — removes all defined coupling orders

Flavor Symmetries

ImposeFlavorSymmetry — computes all invariants for a given global flavor symmetry and automatically assigns them to the couplings of a Lagrangian

FlavorInvariantCoupling — allows to manually assign a flavor structure to a coupling

FlavorInvariants — computes the invariants from a given set of flavor representations