Massive Fishnets

Understand

Recently, infinite families of massive Feynman integrals were found to feature an unexpected Yangian symmetry.

• In the massless case, similar integrability properties are understood via the interpretation of individual Feynman integrals as correlators in the massless fishnet theory introduced by G\"urdo\u{g}an and Kazakov.
• Here we seek for an analogous interpretation of the integrability of massive Feynman integrals.
• We contrast two approaches to define simple massive quantum field theories in four dimensions.