Hints for the existence of hexaquark states in the baryon-antibaryon sector

Abstract

The discovery of some baryon-antibaryon resonances has led us to consider $3q$ $3\overline{q}$ systems as possible candidates. We predict their spectrum in the framework of a constituent model, where the chromomagnetic interaction plays the main role. The relevant parameters are fixed by the present knowledge of tetraquarks. The emerging scenario complies well with experiment; besides the description of the baryon-antibaryon resonances, we find evidence for new tetraquark states, namely, the ${a}_{0}(Y)$ in the hidden strangeness sector and the $Y(4140)$ and $X(4350)$ in the $cs\overline{cs}$ sector. A detailed account of the spectra and the decay channels is provided for future comparisons with data.