Wenqi Ke: Recursion relations and on-shell massive amplitudes

jeudi 13 févr. 2025, 11:00 → 13:00 Europe/Paris

As an alternative to Feynman rules, on-shell formalism offers an efficient and elegant way to compute amplitudes with arbitrary numbers of particles. This construction is based on the so-called recursion relations and relies on the choice of the momentum shift. In this talk, I present a momentum shift in the massive on-shell formalism, which allows us to construct recursively amplitudes in QED, electroweak and supergravity theories. This momentum shift is then applied to examples of $e^{+}{e}^{-}$, $W^{+}{W}^{-}$ and gravitino scatterings. One recovers the Higgs and super-Higgs mechanisms from an on-shell perspective. Finally, some future directions on higher spin Compton scatterings will be outlined.