ALOHA: Automatic libraries of helicity amplitudes for Feynman diagram computations

Priscila De Aquino, William Link, Fabio Maltoni, Olivier Mattelaer, Tim Stelzer

Research output: Contribution to journalArticlepeer-review


We present an application that automatically writes the Helas (HELicity Amplitude Subroutines) library corresponding to the Feynman rules of any quantum field theory Lagrangian. The code is written in Python and takes the Universal FeynRules Output (Ufo) as an input. From this input it produces the complete set of routines, wave-functions and amplitudes, that are needed for the computation of Feynman diagrams at leading as well as at higher orders. The representation is language independent and currently it can output routines in Fortran, C++, and Python. A few sample applications implemented in the MadGraph 5 framework are presented.

Original languageEnglish (US)
Pages (from-to)2254-2263
Number of pages10
JournalComputer Physics Communications
Issue number10
StatePublished - Oct 2012


  • BSM theories
  • Helicity Routine
  • Matrix Element
  • Phenomenological and Empirical Models and Theories

ASJC Scopus subject areas

  • Hardware and Architecture
  • General Physics and Astronomy


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