Using one-boson-exchange Bethe-Salpeter equations, the authors find possible S-wave bound states in isoscalar D*Dbar*/B*Bbar* and in the 0(1+) and 1(2+) doubly heavy systems, with the isovector hidden-heavy channels unbound within the parameter scan.
The only adjustable parameter in the present model isα, which determines the cutoff associated with each exchanged meson through Λ =m+αΛ QCD,Λ QCD = 220 MeV
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Possible Bound States in the $D^\ast\bar D^\ast$/$B^\ast\bar B^\ast$ and $D^\ast D^\ast$/$\bar B^\ast\bar B^\ast$ Systems within the Bethe-Salpeter Formalism
Using one-boson-exchange Bethe-Salpeter equations, the authors find possible S-wave bound states in isoscalar D*Dbar*/B*Bbar* and in the 0(1+) and 1(2+) doubly heavy systems, with the isovector hidden-heavy channels unbound within the parameter scan.