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An Overview of Maximal Unitarity at Two Loops
Henrik Johansson, David A. Kosower, Kasper J. Larsen
We discuss the extension of the maximal-unitarity method to two loops, focusing on the example of the planar double box. Maximal cuts are reinterpreted as contour integrals, with t…
Two-Loop Maximal Unitarity with External Masses
Henrik Johansson, David A. Kosower, Kasper J. Larsen
We extend the maximal unitarity method at two loops to double-box basis integrals with up to three external massive legs. We use consistency equations based on the requirement that…
Uniqueness of two-loop master contours
Simon Caron-Huot, Kasper J. Larsen
Generalized-unitarity calculations of two-loop amplitudes are performed by expanding the amplitude in a basis of master integrals and then determining the coefficients by taking a…
Global Poles of the Two-Loop Six-Point N=4 SYM integrand
Kasper J. Larsen
Recently, a recursion relation has been developed, generating the four-dimensional integrand of the amplitudes of N=4 supersymmetric Yang-Mills theory for any number of loops and l…