Singularity Structure of Maximally Supersymmetric Scattering Amplitudes
We introduce here evidence that loop amplitudes in maximally supersymmetric ( N = 4 ) Yang-Mills theory (SYM) beyond the planar limit share some of the remarkable structures of the planar theory. In particular, we show that through two loops, the four-particle amplitude in full N = 4 SYM has only logarithmic singularities and is free of any poles at infinity—properties closely related to uniform transcendentality and the UV finiteness of the theory. Furthermore, we briefly comment on implications for maximal ( N = 8 ) supergravity theory (SUGRA).
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗