Speaker
Dr
Johannes Heinonen Heinonen
(University of Chicago)
Description
Based on my work arxiv:1208.0601 with R. Hill and M. Solon, I will present a formalism derived from Wigner's little group that allows the construction of heavy particle effective Lagrangians with a Lorentz invariant S-matrix. In contrast to some previous approaches this is achieved directly by field transformations without calculating the Lorentz charges and their commutation relations. I will show how this connects to what is known as "reparametrization" invariance (RPI) and point out a subtlety, that leads to a break down of RPI at order 1/M^4. Our approach is easily generalized to fields of arbitrary spin or self-conjugate fields and can also be modified to be used e.g. in theories of massless fields like SCET.
Primary authors
Dr
Johannes Heinonen Heinonen
(University of Chicago)
Mr
Mikhail Solon
(University of Chicago)
Dr
Richard Hill
(University of Chicago)
