Minkowski Box from Yangian Bootstrap

Understand

We extend the recently developed Yangian bootstrap for Feynman integrals to Minkowski space, focusing on the case of the one-loop box integral.

• The space of Yangian invariants is spanned by the Bloch-Wigner function and its discontinuities.
• Using only input from symmetries, we constrain the functional form of the box integral in all 64 kinematic regions up to twelve (out of a priori 256) undetermined constants.
• These need to be fixed by other means.