Model-independent extraction of |V cb | from B ˉ → D ? ? ν ￣

摘要

We fit the unfolded data of B ˉ 0 → D ? + ? ν ￣ from the Belle experiment, where ? ≡ e , μ , using a method independent of heavy quark symmetry to extrapolate to zero-recoil and extract the value of | V c b | . This results in | V c b | = ( 41.9 ? 1.9 + 2.0 ) × 10 ? 3 , which is robust to changes in the theoretical inputs and very consistent with the value extracted from inclusive semileptonic B decays.