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arXiv 1209.0861hep-ex
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在巴巴尔的粲强子性质的精确测量

Precision measurements of charm hadron properties at Babar

Zachary Huard

备注：
11 pages, 6 figures, to appear in the proceedings of The 5th International Workshop on Charm Physics (Charm 2012)
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摘要：

我们提出了初步的结果自然线宽，$Γ(D^{*+})$，在过渡$D^{*}(2010)^{+} \rightarrow D^0 π^+$。$D^0$在两个衰变通道中重建：$D^0 \rightarrow K^-π^+$和$D^0 \rightarrow K^-π^+π^-π^+$。我们使用Monte Carlo模拟我们的重建分辨率在重建的$D^{*+}$和重建的$D^0$质量的差异。我们拟合一个相对论P波Breit-Wigner形式卷积与测量的分辨率，连同一个背景函数，质量差分布。对于衰变模式$D^0\rightarrow K^-π^+$，我们得到$Γ= 83.5 \pm 1.7 \pm 1.2$ keV和$Δm = m_{D^{* +}} - m_{D^0} = 145425.5 \pm 0.6 \pm 2.6$ keV，其中引用的错误是统计和系统，分别。对于$D^0\rightarrow K^-π^+π^-π^+$模式，我们此时不引用宽度测量，而是测量$Δm = m_{D^{* +}} - m_{D^0} = 145426.5 \pm 0.4 \pm 2.6 $ keV。此外，我们提出了初步的结果，从衰变模式$Λ_c (2880)^+ \rightarrow Λ_c^+π^+π^-$的质量，宽度和准二体分支比的$Λ_c(2880)^+$重子。我们测量$m(Λ_c(2880)^+) - m(Λ_c(2286)^+) = 594.9 \pm 0.4 \pm 0.3$ MeV和$Γ(Λ_c(2880)^+) = 6.2 \pm 1.4 \pm 1.5$ MeV，其中误差分别是统计的和系统的。

英文摘要：

We present preliminary results on the natural line width, $Γ(D^{*+})$, in the transition $D^{*}(2010)^{+} \rightarrow D^0 π^+$. The $D^0$ is reconstructed in two decay channels: $D^0 \rightarrow K^-π^+$ and $D^0 \rightarrow K^-π^+π^-π^+$. We use Monte Carlo to simulate our reconstruction resolution in the difference of the reconstructed $D^{*+}$ and reconstructed $D^0$ masses. We fit a relativistic P-wave Breit-Wigner form convolved with the measured resolution, together with a background function, to the mass difference distribution. For the decay mode $D^0\rightarrow K^-π^+$ we obtain $Γ= 83.5 \pm 1.7 \pm 1.2$ keV and $Δm = m_{D^{* +}} - m_{D^0} = 145425.5 \pm 0.6 \pm 2.6$ keV, where the quoted errors are statistical and systematic, respectively. For the $D^0\rightarrow K^-π^+π^-π^+$ mode, we do not quote a width measurement at this time, but measure $Δm = m_{D^{* +}} - m_{D^0} = 145426.5 \pm 0.4 \pm 2.6 $ keV. Additionally, we present preliminary results from the decay mode $Λ_c (2880)^+ \rightarrow Λ_c^+π^+π^-$ for the mass, width and quasi-two-body branching ratios of the $Λ_c(2880)^+$ baryon. We measure $m(Λ_c(2880)^+) - m(Λ_c(2286)^+) = 594.9 \pm 0.4 \pm 0.3$ MeV and $Γ(Λ_c(2880)^+) = 6.2 \pm 1.4 \pm 1.5$ MeV, where the errors are statistical and systematic, respectively.

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