EFT amplitudes via on-shell methods

TYPEHigh Energy Physics Seminar
Speaker:Yaniv Weiss
Affiliation:Technion
Organizer:Yotam Soreq
Date:18.10.2021
Time:11:30 - 13:00
Location:Lidow Nathan Rosen (300)
Abstract:
 
Abstract
 
We use on shell methods to compute EFT scattering amplitudes, both  massless and massive, with no reference to a Lagrangian. On shell methods avoid the usual complications that accompany an amplitude computation a la Feynman. Lorentz symmetry, global symmetry, Bose statistics and unitarity (almost) completely fix the allowed kinematical structures. We will demonstrate this approach by calculating several amplitudes completely "bottom-up", i.e., with unitarity and only the known symmetries and particles to guide us. Applying on-shell methods to an electroweak-like sector of the Standard Model, we demonstrate how relations between masses and couplings, which are the result of the Higgs mechanism, now emerge by imposing unitarity.
 
 
There will be also online access:
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https://technion.zoom.us/j/93917521043
 
Meeting ID: 939 1752 1043