Speaker: Karol Kampf
Title: Amplitude method studies of effective field theories
Abstract: Description of low-energy interactions of Goldstone particles of
spontaneously broken symmetries is traditionally done using the most
general action based on the underlying symmetry. The explicitly constructed
Lagrangian can be then used for calculating given scattering amplitudes.
However this process is not very efficient as can be demonstrated already
at the tree-level for relatively small number of external particles. The
modern amplitude methods offer different approach where it is possible to
avoid redundancy stemming from the standard Feynman diagram calculations.
The methods represent not only an efficient way of calculating scattering
amplitudes but can be employed in theoretical studies of their interesting
properties. This allowed among other things to classify the effective
models. Generalization beyond the standard vanishing soft limit, so-called
Adler zero, will be discussed.
Host: Da Liu
Room: 432
