Causal representation of physical observables through the Loop-Tree Duality

Dr. Roger José Hernández Pinto, FCFM, Universidad Autónoma de Sinaloa

High precision observables require the computation of integrals in the Feynman representation. Since theoretical predictions are becoming complicated due to the appearance of multiple singularities in the intermediate steps, several groups are working to find algorithms to compute physical quantities in a more efficient way. In this talk, we will present one of the efforts based on the Loop-Tree Duality theorem. We will show that in this framework, non physical singularities are absent and only physical singularities remain at any loop level. Finally, we demonstrate that this representation, so-called causal representation, can help to build cross-sections in 4-dimensions based on the Four-Dimensional Unsubtraction method.

Liga Zoom: https://cuaed-unam.zoom.us/j/82622280628?pwd=MDg2NEtoZWNUaDJpMGhyRmh4MWwwQT09