Spherical contours translate branch-cut discontinuities into Feynman parameter space, enabling direct computation of leading IR divergences and a momentum-space-independent method to obtain one-loop integrands, with examples in N=4 SYM.
Positive Geometries and Canonical Forms
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Spherical Contours, IR Divergences and the geometry of Feynman parameter integrands at one loop
Spherical contours translate branch-cut discontinuities into Feynman parameter space, enabling direct computation of leading IR divergences and a momentum-space-independent method to obtain one-loop integrands, with examples in N=4 SYM.