# A cluster bootstrap for two-loop MHV amplitudes

Golden, John (Department of Physics, Brown University, Box 1843, Providence, RI, 02912-1843, U.S.A.) ; Spradlin, Marcus (Department of Physics, Brown University, Box 1843, Providence, RI, 02912-1843, U.S.A.)

03 February 2015

Abstract: We apply a bootstrap procedure to two-loop MHV amplitudes in planar N = 4 $\mathcal{N}=4$ super-Yang-Mills theory. We argue that the mathematically most complicated part (the Λ 2 B 2 coproduct component) of the n -particle amplitude is uniquely determined by a simple cluster algebra property together with a few physical constraints (dihedral symmetry, analytic structure, supersymmetry, and well-defined collinear limits). We present a concise, closed-form expression which manifests these properties for all n .

Published in: JHEP 1502 (2015) 002