Speaker
Description
We present calculations for Dalitz decays of nucleon resonances and hyperons, based on a covariant quark model, where the contribution of the quark core is complemented with contributions from the meson cloud.
The model was originally developed for the calculation of transition form factors in the electroproduction of nucleon resonances and transitions between hyperon states, in the spacelike region.
More recently, the model was extended to the timelike region and used to calculate the $\Delta(1232)$, $N(1520)$ and $N(1535)$ Dalitz decay rates, and compared with the available data.
We discuss also estimates of some hyperon Dalitz decays, including the $\Sigma^{\ast 0} (1385) \to e^+ e^- \Lambda(1116)$, $\Sigma^{\ast +} (1385) \to e^+ e^- \Sigma^+ (1193)$, $\Sigma^{\ast 0} (1385) \to e^+ e^- \Sigma^0 (1193)$
and $\Xi^{\ast 0} (1585) \to e^+ e^- \Xi^0 (1318)$ decays.
