Study of doubly strange systems using stored antiprotons

Bound nuclear systems with two units of strangeness are still poorly known despite their importance for many strong interaction phenomena. Stored antiprotons beams in the GeV range represent an unparalleled factory for various hyperon-antihyperon pairs. Their outstanding large production probability in antiproton collisions will open the floodgates for a series of new studies of systems which contain two or even more units of strangeness at the P‾ANDA experiment at FAIR. For the first time, high resolution γ-spectroscopy of doubly strange ΛΛ-hypernuclei will be performed, thus complementing measurements of ground state decays of ΛΛ-hypernuclei at J-PARC or possible decays of particle unstable hypernuclei in heavy ion reactions. High resolution spectroscopy of multistrange Ξ−-atoms will be feasible and even the production of Ω−-atoms will be within reach. The latter might open the door to the |S|=3 world in strangeness nuclear physics, by the study of the hadronic Ω−-nucleus interaction. For the first time it will be possible to study the behavior of Ξ‾+ in nuclear systems under well controlled conditions

Perspective Study of Charmonium and Exotics above DDˉD\bar D Threshold

The spectroscopy of exotic states with hidden charm is discussed.Together with charmonium it is a good testing tool for theories of strong interactions including QCD in both perturbative and non-perturbative regime, lattice QCD, potential models and phenomenological models.An elaborated analysis of exotics spectrum is given, and attempts to interpret recent experimental data in the above $D\bar D$ threshold region are considered.Experimental data from different collaborations (BES, BaBar, Belle, LHCb) are analyzed with special attention given to new states with hidden charm which were discovered recently.Some of these states can be interpreted as higher-lying charmonium states and tetraquarks with hidden charm.It has been shown that charge/neutral tetraquarks must have their neutral/charge partners with mass values differ by few MeV. This hypothesis coincides with that proposed by Maiani and Polosa.But much more data on different decay modes are needed before firmer conclusions can be made.These data can be derived directly from the experiments using the high quality antiproton beam with momentum up to 15 GeV/$c$ and proton-proton collisions with momentum up to 26 GeV/$c$

Perspective Study of Charmonium and Exotics above DDˉD\bar D Threshold

The spectroscopy of exotic states with hidden charm is discussed.Together with charmonium it is a good testing tool for theories of strong interactions including QCD in both perturbative and non-perturbative regime, lattice QCD, potential models and phenomenological models.An elaborated analysis of exotics spectrum is given, and attempts to interpret recent experimental data in the above $D\bar D$ threshold region are considered.Experimental data from different collaborations (BES, BaBar, Belle, LHCb) are analyzed with special attention given to new states with hidden charm which were discovered recently.Some of these states can be interpreted as higher-lying charmonium states and tetraquarks with hidden charm.It has been shown that charge/neutral tetraquarks must have their neutral/charge partners with mass values differ by few MeV. This hypothesis coincides with that proposed by Maiani and Polosa.But much more data on different decay modes are needed before firmer conclusions can be made.These data can be derived directly from the experiments using the high quality antiproton beam with momentum up to 15 GeV/$c$ and proton-proton collisions with momentum up to 26 GeV/$c$