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v3.1
We introduce a momentum space amplituhedron for tree-level scattering amplitudes of 3D Chern-Simons matter theory (often termed ABJM). The talk will begin by reviewing (i) The momentum amplituhedron for 4D super Yang-Mills theory, and (ii) Grassmannian formulas for the ABJM amplitudes. We then present the construction of the orthogonal momentum amplituhedron, defined as a product of positive orthogonal Grassmannian and the moment curve. Finally, we discuss canonical forms of the amplituhedron, their associated singularities, and the boundary structures of the geometry.