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Rare decays of B-> J/ψD^(*) and B->η_c D^(*)in pQCD Approach

Ying Li·Cai-Dian Lu·Cong-Feng Qiao
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Abstract

Motivated by the recent measurement of the upper limit of ${B}^0 \to J/ψD$ branching ratio, which is important in accounting for the soft $J/ψ$ production in B decays, we investigate ${B}^0 \to J/ψD^{(\star)}$ and $η_c D^{(\star)}$ decays in perturbative QCD approach based on $k_T$ factorization. Being pure annihilation (W-exchange) decays, these branching ratios are estimated to be at the order of $10^{-5} \sim 10^{-7}$, which are just at the corner of being observable at the $B$ factories. The measurements of these decay channels may help us to understand the QCD dynamics in the corresponding energy scale, especially the reliability of pQCD approach to these processes.

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Ying Li, Cai-Dian Lu, Cong-Feng Qiao. 2005-12-28. Rare decays of B-> J/ψD^(*) and B->η_c D^(*)in pQCD Approach. https://doi.org/10.1103/physrevd.73.094006

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