Erlangen 2026 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 28: Invited Talks

HK 28.4: Hauptvortrag

Donnerstag, 19. März 2026, 12:30–13:00, MED 00.915

Dispersive analyses of Primakoff reactions with kaons — •Bastian Kubis — Helmholtz-Institut für Strahlen- und Kernphysik (Theorie), Universität Bonn, Nussallee 14-16, 53115 Bonn

The scattering of a charged-kaon beam off the Coulomb field of a heavy nucleus, as planned at the AMBER experiment at CERN, allows one to investigate photon-kaon reactions to various final states, so-called Primakoff processes. We investigate two important such reactions. First, we analyse γ K → K π and show how dispersion theory provides access to both the chiral anomaly and radiative resonance couplings in a unified manner. Second, from Compton scattering on the kaon, electric and magnetic polarisabilities can be extracted, which provide fundamental structure information about the lightest strange hadrons. We discuss similarities and differences to the analogous COMPASS analysis with charged pions, and show how the effects of the K^*(892) resonance, seemingly impeding the polarisability determination, can be included model-independently.

Keywords: Primakoff reactions; Chiral perturbation theory; Dispersion theory; Strangeness spectroscopy; Polarisabilities