The propagator seagull: general evaluation of a two loop diagram

Barak Kol, Ruth Shir*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


We study a two loop diagram of propagator type with general parameters through the Symmetries of Feynman Integrals (SFI) method. We present the SFI group and equation system, the group invariant in parameter space and a general representation as a line integral over simpler diagrams. We present close form expressions for three sectors, each with three or four energy scales, for any spacetime dimension d as well as the ϵ expansion. We determine the singular locus and the diagram’s value on it.

Original languageAmerican English
Article number83
JournalJournal of High Energy Physics
Issue number3
StatePublished - 1 Mar 2019

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© 2019, The Author(s).


  • Perturbative QCD
  • Scattering Amplitudes


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