Doubly charmed tetraquarks in Bc and Ξbc decays
The phenomenology of the so-called $X$, $Y$ and $Z$ hadronic resonances is hard to reconcile with standard charmonium or bottomonium interpretations. It has been suggested that some of these new hadrons can possibly be described as tightly bound tetraquark states and/or as loosely bound two-meson molecules. In the present paper we focus on the hypothetical existence of flavored, doubly charmed tetraquarks. Such states might also carry double electric charge, and in this case, if discovered, they could univocally be interpreted in terms of compact tetraquarks. Flavored tetraquarks are also amenable to lattice studies, as their interpolating operators do not overlap with ordinary meson ones. We show that doubly charmed tetraquarks could significantly be produced at the LHC from ${B}_{c}$ or ${\ensuremath{\Xi}}_{bc}$ heavy baryons.