Description
The expansion of integrals and amplitudes in particular kinematic limits is a useful method for gaining insight into their analytic structure. However, developing robust, efficient and verifiable algorithms to identify the relevant loop momentum regions is not a trivial task. One well known avenue for finding the regions is the use of Feynman or Lee-Pomeransky parameters. I will review the existing construction of "facet" regions in parameter space, which capture the behaviour of Euclidean integrals, and discuss how additional regions (Potential/Glauber/Landshoff, generally "hidden") appear due to cancellations between monomials in parameter space for physical scattering kinematics. I will present an update on ongoing efforts to find and classify "hidden" regions and a promising method for solving the related, yet simpler, problem of rewriting Feynman integrals as a sum of integrals with real, positive integrands in the Minkowski regime.