# Math Physics Seminar (309 VAN) – Professor Wayne Polyzou | physics and astronomy

**“Two-body currents in phenomenological models of the strong interaction”**

**Professor Wayne Polyzou; Department of Physics and Astronomy, University of Iowa**

Electromagnetic probes are a useful tool for studying the dynamics of hadronic particles. Indeed, in the one-photon exchange approximation, the scattering matrix elements are linear in the matrix elements of the hadronic current operator. Realistic phenomenological models of hadronic systems can provide spectral and scattering observables that are consistent with experiment for various nuclei.

To study these models with electromagnetic probes, it is necessary to have models of the electric current of the hadrons consistent with the interaction of the model. Relativistic covariance and current conservation cannot be satisfied by assuming that the hardonic current is the sum of single-hadron currents, but satisfying these two conditions does not fix the current. In this talk, I propose a method to construct many hadronic body current operators that are consistent with model interactions by using the Weyl representation to construct a gauge-invariant extension of the dynamics by replacing the momentum operators in the Weyl representation of the interaction by gauge covariant derivatives.

Those wishing to join the seminar via Zoom can do so with Meeting ID 973 3626 5389.