Relation between $T_{cc,bb}$ and $X_{c,b}$ from QCD

J. M. Dias, S. Narison, F. S. Navarra +2

We have studied, using double ratio of QCD (spectral) sum rules, the ratio between the masses of $T_{cc}$ and X(3872) assuming that they are respectively described by the $D-D^{\ast }$…