Within the Bethe-Salpeter framework the authors find bound-state solutions for D anti-D pairs under all three coupling sets examined and for Ds anti-Ds pairs only in a restricted region, yielding predicted B+ branching fractions of 1.09e-5 to 2.006e-3 and 1.56e-6 to 4.14e-4 respectively.
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Production of $D_s\bar{D}_s$ and $D\bar{D}$ bound states in the $B$ decays within the Bethe-Salpeter framework
Within the Bethe-Salpeter framework the authors find bound-state solutions for D anti-D pairs under all three coupling sets examined and for Ds anti-Ds pairs only in a restricted region, yielding predicted B+ branching fractions of 1.09e-5 to 2.006e-3 and 1.56e-6 to 4.14e-4 respectively.