Package madgraph :: Package core :: Module helas_objects

Module helas_objects

Definitions of objects used to generate language-independent Helas calls: HelasWavefunction, HelasAmplitude, HelasDiagram for the generation of wavefunctions and amplitudes, HelasMatrixElement and HelasMultiProcess for generation of complete matrix elements for single and multiple processes; and HelasModel, which is the language-independent base class for the language-specific classes for writing Helas calls, found in the iolibs directory

Classes

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IdentifyMETag
DiagramTag daughter class to identify processes with identical matrix elements.

HelasWavefunction
HelasWavefunction object, has the information necessary for writing a call to a HELAS wavefunction routine: the PDG number, all relevant particle information, a list of mother wavefunctions, interaction id, all relevant interaction information, fermion flow state, wavefunction number

HelasWavefunctionList
List of HelasWavefunction objects.

HelasAmplitude
HelasAmplitude object, has the information necessary for writing a call to a HELAS amplitude routine:a list of mother wavefunctions, interaction id, amplitude number

HelasAmplitudeList
List of HelasAmplitude objects

HelasDiagram
HelasDiagram: list of HelasWavefunctions and a HelasAmplitude, plus the fermion factor associated with the corresponding diagram.

HelasDiagramList
List of HelasDiagram objects

HelasMatrixElement
HelasMatrixElement: list of processes with identical Helas calls, and the list of HelasDiagrams associated with the processes.

HelasMatrixElementList
List of HelasMatrixElement objects

HelasDecayChainProcess
HelasDecayChainProcess: If initiated with a DecayChainAmplitude object, generates the HelasMatrixElements for the core process(es) and decay chains.

HelasDecayChainProcessList
List of HelasDecayChainProcess objects

HelasMultiProcess
HelasMultiProcess: If initiated with an AmplitudeList, generates the HelasMatrixElements for the Amplitudes, identifying processes with identical matrix elements

Variables

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logger = logging.getLogger('madgraph.helas_objects')

__package__ = 'madgraph.core'