Analytic result for the two-loop six-point NMHV amplitude in N=4 super Yang-Mills theory

Understand

We provide a simple analytic formula for the two-loop six-point ratio function of planar N = 4 super Yang-Mills theory.

• This result extends the analytic knowledge of multi-loop six-point amplitudes beyond those with maximal helicity violation.
• We make a natural ansatz for the symbols of the relevant functions appearing in the two-loop amplitude, and impose various consistency conditions, including symmetry, the absence of spurious poles, the correct collinear behaviour, and agreement with the operator product expansion for light-like (super) Wilson loops.
• This information reduces the ansatz to a small number of relatively simple functions.