Challenges and opportunities with hyperon spectroscopy at FAIR + Hyperons: from the internal structure and strong interactions to CP symmetry studies

Piotr:
Spectroscopy of double and triple strange baryons offers interesting physic programme discussed in white paper “Physics Opportunities with proton and pion beams at GSI/FAIR”, currently under preparation. First of all mass spectrum of excited hyperon states is badly known and there is almost no progress since 80’es. On the other hand high intensity proton beams at FAIR, reaching sqrt(s)=7.6 GeV, combined with high rate capabilities and excellent vertex and momentum resolutions of CBM provide an excellent opportunity for systematic exploration, complementary to those planned and J-PARC and JLab .  Furthermore, studies of hadronic, electromagnetic and semi-leptonic decays of ground and excited hyperon states can provide unique insight into their structure that can be confronted  with results of various hadronic models and lattice qcd calculation, progressing our understanding of strong interactions that is one of mission of QCD@FAIR program.  In the discussions relevance of hyperon-meson strong interactions, that can also be studied at FAIR, to  CP tests in Cascade and Omega weak decays in e+e- annihilation  has been addressed and will be discussed in details in the following talk of Andrzej Kupść

Andrzej:
I will discuss weak semileptonic and non leptonic decays of hyperons in a context of possible experiments at FAIR .
Semileptonic decays are tools to determine  hyperon structure. The results could be directly compared with first principle lattice QCD calculations. At the same time a synergy effort between the calculations and experiment could lead  to a precise  determination of Vus element of the CKM  matrix.
The most promising processes to reveal baryon CP violation in strange and charm quark sectors are non-leptonic decays. A prerequisite  of such studies is 
good understanding  of baryon meson strong interactions in systems with strangeness  S=-2,-1,1.