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

Abstract : Using 226 million $B\bar{B}$ events recorded on the $\Upsilon(4S)$ resonance with the BABAR detector at the SLAC $e^+e^-$ storage rings PEPII, 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 dependence of their differential rate on $w$, the product of the four-velocities of $B^-${} and $D^{*0}$, and using the description of the form factor $F(w)$ by Caprini et al., we obtain the preliminary results $\rho^2_{A_1} = 1.15\pm 0.06 \pm 0.08$, $F(1)\cdot|V_{cb}| = (36.3\pm 0.6 \pm 1.4)\cdot 10^{-3}$, and ${\cal B}(B^-\to D^{*0} e^-\bar\nu_e) = (5.71\pm 0.08\pm 0.41)%$. The first errors are statistical and the second ones are systematic. \\
Document type :
Conference papers

http://hal.in2p3.fr/in2p3-00165248
Contributor : Dominique Girod <>
Submitted on : Wednesday, July 25, 2007 - 2:17:51 PM
Last modification on : Saturday, November 28, 2020 - 12:58:03 PM

### Identifiers

• HAL Id : in2p3-00165248, version 1
• ARXIV : 0707.2655

### Citation

B. Aubert, M. Bona, D. Boutigny, Y. Karyotakis, J.P. Lees, et al.. Measurement of the Decay $B^- \to D^{*0} e^- \bar{\nu}$. 2007 Europhysics Conference on High Energy Physics, Jul 2007, Manchester, United Kingdom. ⟨in2p3-00165248⟩

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