5 papers
Imaginary parts and discontinuities of Wilson line correlators
Eric Laenen, Kasper J. Larsen, Robbert Rietkerk
We introduce a notion of position-space cuts of eikonal diagrams, the set of diagrams appearing in the perturbative expansion of the correlator of a set of straight semi-infinite W…
Maximal Unitarity for the Four-Mass Double Box
Henrik Johansson, David A. Kosower, Kasper J. Larsen
We extend the maximal-unitarity formalism at two loops to double-box integrals with four massive external legs. These are relevant for higher-point processes, as well as for heavy…
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…