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arXiv · hep-ph/9706214

W-exchange and W-annihilation processes of B mesons

Dongsheng Du·Li-bo Guo·Da-Xin Zhang
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Abstract

Using the PQCD method we calculate the W-exchange and the W-annihilation processes of B mesons, which in general involve a charm quark or anti-quark in the final state. The nonvanishing amplitudes of these processes are found to be suppressed by a factor of $m_c/m_b$ compared to the tree or the time-like penguin processes, but some of them are within the reach of observation at the future B-factories, and $\bar B_d^0 \to D^+_s K^-$ whose branching ratio is found to be $6.6 \times 10^{-6}$ can be found even before the B-factory era. Comparisons with the results based on the BSW model are also given.

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Dongsheng Du, Li-bo Guo, Da-Xin Zhang. 1997-06-02. W-exchange and W-annihilation processes of B mesons. https://doi.org/10.1016/s0370-2693(97)00657-6

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