Narrow Results

Using KAON-MAID, an operator for kaon photo- and electro-production on the nucleon, we calculate contributions of kaon–hyperon final states to the Gerasimov–Drell–Hearn (GDH) integrals on the proton. We also calculate the corresponding contributions to the forward spin polarizability γ₀ of the proton. By extending the operator to the finite Q² region we then calculate kaon contributions to the generalized GDH integrals, as well as to the longitudinal-transverse polarizability δ₀. Our results show relatively small but still sizable contributions.

The FINUDA spectrometer is installed at one of the interaction points of the DAΦNE e⁺e^- collider in Frascati(I). By stopping the low energy K^- from the ɸ(1020) decays, FINUDA performed a rich program of studies of K^- induced interactions on a set of nuclear targets. A survey of the results will be given, with emphasis on the study of non-mesonic weak decays of Λ-hypernuclei and on the search for deeply bound kaonic nuclear clusters.

Search for heavy neutral lepton (HNL) production in charged kaon decays using the data collected by kaon experiments NA48/2 and NA62 at CERN are reported. Upper limits are established on the elements of the extended neutrino mixing matrix for heavy neutral lepton mass in the range 130–450 MeV, improving on the results from previous HNL production search.