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$|V_{ub}|$ determination by $B \to D_s π$

H. Hayakawa·K. Hosokawa·T. Kurimoto
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Abstract

We investigate $\ovar{B^0} \to D_s^- π^+$ decay in perturbative QCD approach which has recently been applied to $B$ meson decays. $\ovar{B^0} \to D_s^- π^+$ decay (and its charge conjugated mode) can be one of the hopeful modes to determine $|V_{ub}|$ since it occurs through $b \to u$ transition only. We estimate both factorizable and non-factorizable contribution, and show that the non-factorizable contribution is much less than the factorizable one. Our calculation gives ${BR}(\ovar{B^0} \to D_s^- π^+) = (50 \sim 70) \times f_{Ds}^2|{V_{ub}}{V_{cs}}|^2$.

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H. Hayakawa, K. Hosokawa, T. Kurimoto. 2002-12-06. $|V_{ub}|$ determination by $B \to D_s π$. https://doi.org/10.1142/s021773230301137x

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