Loops, Trees and the Search for New Physics

In this article the authors consider why unifying the forces of nature may not be as difficult as physicists thought it would be. Topics include an overview of concepts introduced by American physicist Richard Feynman that guided physicists' understanding of particle collisions, why the authors feel Feynman's concepts have outlived their usefulness, and an in-depth examination of a novel way of analyzing particle processes developed by the authors, called the unitarity method, that bypasses the complexity of Feynmann's techniques.