Automatic generation of quarkonium amplitudes in NRQCD

Pierre Artoisenet, Fabio Maltoni, Tim Stelzer

Research output: Contribution to journalArticlepeer-review


We present a simple method to automatically evaluate arbitrary tree-level amplitudes involving the production or decay of a heavy quark pair Q in a generic 2S+1L J [1,8], S- or P-wave state, i.e., the leading short distance coefficients appearing in the NRQCD factorization formalism. Our approach is based on extracting the relevant contributions from the open heavy quark-antiquark amplitudes through an expansion with respect to the quark-antiquark relative momentum and the application of suitable color and spin projectors. To illustrate the capabilities of the method and its implementation in MadGraph a few applications to quarkonium collider phenomenology are presented.

Original languageEnglish (US)
Article number102
JournalJournal of High Energy Physics
Issue number2
StatePublished - Feb 1 2008


  • Hadronic colliders
  • QCD

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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