# Measurement of the Decay $\B- \to D^{*0} e^- \bar{nu}_e$

Abstract : Using 226 million $B\bar{B}$ events recorded on the $\Upsilon(4S)$ resonance with the BABAR detector at the SLAC $e^+e^-$ PEPII storage rings, we reconstruct $B^- \to D^{*0} e^-\bar{\nu}_e$ decays using the decay chain $D^{*0} \to D^0\pi^0$ and $D^0 \to K^-\pi^+$. From the $w$ dependence of their differential rate, and using the form factor description by Caprini et al., we obtain the results $\rho_{A_1}^2 = 1.16\pm 0.06 \pm 0.08$, $F(1)\cdot|V_{cb}| =(35.9\pm 0.6 \pm 1.4)\cdot 10^{-3}$, and ${\cal{B}}(B^- \to D^{*0}e^-\bar{\nu}_e) = (5.56\pm 0.08\pm 0.41)%$.
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Submitted on : Monday, January 28, 2008 - 5:05:18 PM
Last modification on : Sunday, June 26, 2022 - 11:47:54 AM

### Citation

B. Aubert, M. Bona, Y. Karyotakis, J.P. Lees, V. Poireau, et al.. Measurement of the Decay $\B- \to D^{*0} e^- \bar{nu}_e$. Physical Review Letters, American Physical Society, 2008, 100, pp.231803. ⟨10.1103/PhysRevLett.100.231803⟩. ⟨in2p3-00221470⟩

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