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arXiv 0707.2655hep-ex
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衰变B-> D*0 e- nubar的测量

Measurement of the Decay B- --> D*0 e- nubar

The BABAR Collaboration, B. Aubert

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8 pages, 2 postscript figures, submitted to EPS2007
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摘要：

利用SLAC $e^+e^-$储存环PEPII的BABAR探测器在$Υ(4S)$共振上记录的2.26亿个$B\bar{B}$事件，我们使用衰变链$D^{*0}\to{}D^0{}π^0$和$D^{0}\to{}K^-π^+$重建了$B^-\to D^{*0} e^-\barν_e$衰变。根据它们的微分速率对$w$的依赖性，$B^-$ {}和$D^{*0}$的四个速度的乘积，并使用Caprini等人对形状因子$F(w)$的描述，我们获得了初步结果$ρ^2_{A_1} = 1.15\pm 0.06 \pm 0.08$、$F(1)\cdot|V_{cb}| = (36.3\pm 0.6 \pm 1.4)\cdot 10^{-3}$和${\cal B}(B^-\to D^{*0} e^-\barν_e) = (5.71\pm 0.08\pm 0.41)%$。第一个错误是统计性的，第二个错误是系统性的。\\

英文摘要：

Using 226 million $B\bar{B}$ events recorded on the $Υ(4S)$ resonance with the BABAR detector at the SLAC $e^+e^-$ storage rings PEPII, we reconstruct $B^-\to D^{*0} e^-\barν_e$ decays using the decay chain $D^{*0}\to{}D^0{}π^0$ and $D^{0}\to{}K^-π^+$. 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 $ρ^2_{A_1} = 1.15\pm 0.06 \pm 0.08$, $F(1)\cdot|V_{cb}| = (36.3\pm 0.6 \pm 1.4)\cdot 10^{-3}$, and ${\cal B}(B^-\to D^{*0} e^-\barν_e) = (5.71\pm 0.08\pm 0.41)%$. The first errors are statistical and the second ones are systematic. \\

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