John Terning, "Scattering Amplitudes for Monopoles and the Pairwise Helicities"


After a brief review of the challenges of calculating scattering amplitudes for electric and magnetic charges, as well as a discussion of Wigner’s “little group” and the helicity amplitude approach, I will discuss how S-matrix  calculations can be extended to include magnetic charges. The answer involves an extension of the concept of  helicity to a "pairwise helicity" involving two particles.

The agenda of this meeting is empty