Hadron Spectroscopy: Hadron Spectroscopy
- Annalisa D'Angelo (Universita' di Roma Tor Vergata & INFN Roma Tor Vergata)
The large data sample accumulated by the Belle experiment at KEKB asymmetric energy $e^+ e^-$ collider provides opportunities
to study hyperons and charmed baryons.
In this presentation, we report recent measurements on these topics from Belle,
including absolute branching fractions of $\Xi_c$ and an observation of new excited $\Omega^-$.
Understanding the nature of the baryon spectrum will provide useful insight of quantum chromodynamics in the non-perturbative regime. Significant progress has been made in the $N^*$ regime, but little is known about doubly-strange hyperons. Most knowledge of the Cascade baryons stems from Kaon-nucleon experiments from the 1960s and 1970s or the more recent CLAS experiment at Jefferson Lab....
New models for photo- and electroproduction of kaons on the proton were constructed [1,2,3] utilizing new experimental data from LEPS, GRAAL, and particularly CLAS collaborations. Higher spin nucleon (spin-3/2 and spin-5/2) and hyperon (spin-3/2) resonances were included using the consistent formalism and were found to play an important role in the description of data. In these analyses, we...