Abstract
We study the contributions of intermediate bottomonium-like states and the bottom meson loops in the heavy quark spin flip transitions . Depending on the constructive or destructive interferences between the -exchange and the bottom meson loops mechanisms, we predict two possible branching ratios for each process: BR or , and or . The contribution of the bottom meson loops is found to be considerably larger than that of the -exchange in the transitions, while its decay rates are not comparable to those of heavy quark spin conserved processes. We also predict the contribution of the charm meson loops in the branch fractions of .
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