The decay Upsilon -> D- anti-B0 Ds+ is predicted to show a peak near 7415-7425 MeV from a spin-2 tetraquark molecule, plus a threshold dip.
$D^*D\pi$ form factor revisited
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abstract
The $D^*D\pi$ form factor is evaluated in a QCD sum rule calculation for both $D$ and $\pi$ off-shell mesons. We study the Borel sum rule for the three-point function of one pseudoscalar, one axial and one vector meson currents. We find that the momentum dependence of the form factors is very different if the $D$ or the $\pi$ meson is off-shell, but they lead to the same coupling constant in the $D^*D\pi$ vertex.
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$T_{bc\bar s}$ states in the process $\Upsilon \to D^{-} \bar B^{0} D_s^{+}$
The decay Upsilon -> D- anti-B0 Ds+ is predicted to show a peak near 7415-7425 MeV from a spin-2 tetraquark molecule, plus a threshold dip.