Seminar on Theoretical Nuclear Physics

24.11.16 10:15

Electromagnetic interactions with light baryons

Astrid Hiller Blin (Valencia)

We study the low-energy behaviour of baryons subjected to external electromagnetic fields.  The processes considered are Compton and electron scattering off baryon targets, as well as meson photoproduction.  On the one hand, the goal of the study of scattering reactions is to extract clean information about observables such as polarizabilities, electric dipole moments, charge radii and electromagnetic densities.  We used the framework of fully covariant SU(3) ChPT with the explicit inclusion of spin-3/2 degrees of freedom, and predicted some hyperon electromagnetic properties for the first time.  Furthermore, we also extracted an upper limit for the branching ratios of some CP-violating decays, giving them a much stronger constraint than experimentally possible so far.  On the other hand, the analysis of meson-photoproduction cross sections allows one to get information about baryon resonances and exotics. We analysed the Pc(4450) structure in J/psi photoproduction off proton targets, extracting information about its branching ratio and the angular behaviour of the differential cross sections.


(Seminarraum I; please note unusual date and time!)

Category: Feldtheorie, Kernphysik