EFT Coffee: Michael Stadlbauer "Phase-Space Harmonics and EFT Non-Renormalization"

Friday 13 Nov 2026, 13:30 → 14:30 Europe/Zurich

4/2-037 - TH meeting room (CERN)

Harmonics on multiparticle phase space generalize the familiar partial-wave expansion and provide a common language for scattering amplitudes and EFT operators. I will explain how their orthogonality simplifies on-shell cuts and constrains operator mixing. Using the Standard Model effective field theory as an example, I will show how this framework recovers one-loop helicity selection rules and yields new higher-loop non-renormalization theorems.