EFT Coffee: Andreas Helset, "Soft Scalars in Effective Field Theory"

Friday 22 Mar 2024, 13:15 → 14:30 Europe/Zurich

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

Meeting for informal discussion of EFT-related topics 
List of potential papers to be discussed

13:15 → 13:30 Coffee

13:30 → 14:30 Soft Scalars in Effective Field Theory

We derive a soft theorem for a massless scalar in an effective field theory with generic field content using the geometry of field space. This result extends the geometric soft theorem for scalar effective field theories by allowing the massless scalar to couple to other scalars, fermions, and gauge bosons. The soft theorem keeps its geometric form, but where the field-space geometry now involves the full field content of the theory. As a bonus, we also present novel double soft theorems with fermions, which mimic the geometric structure of the double soft theorem for scalars.

Based on arXiv:2403.12142

Speaker: Andreas Helset (CERN)