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arXiv 2004.13910hep-ex
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14个互斥强子$D$衰变到$η$的绝对分支分数的测量

Measurements of Absolute Branching Fractions of Fourteen Exclusive Hadronic $D$ Decays to $η$

BESIII Collaboration

备注：
11 pages, 3 figures
发表信息：
Phys. Rev. Lett. 124, 241803 (2020)
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摘要：

利用BESIII探测器在质心能量为3.773GeV处获得的$e^+e^-$碰撞数据的$2.93\,\rm fb^{-1}$，我们首次测量了14个强子$D^{0(+)}$衰变到排他性末态的绝对分支分数，$D^0\to K^-π^+η$、$K^0_Sπ^0η$、$K^+K^-η$、$K^0_SK^0_Sη$、$K^-π^+π^0η$、$K^0_Sπ^+π^-η$、$K^0_Sπ^0π^0η$和$π^+π^-π^0η$ ; $D^+\to K^0_Sπ^+η$、$K^0_SK^+η$、$K^-π^+π^+η$、$K^0_Sπ^+π^0η$、$π^+π^+π^-η$和$π^+π^0π^0η$。在这些衰变中，$D^0\to K^-π^+η$和$D^+\to K^0_Sπ^+η$衰变具有最大的分支分数，分别为$\mathcal{B} (D^0\to K^-π^+η)=(1.853\pm0.025_{\rm stat}\pm0.031_{\rm syst})\%$和$\mathcal{B}(D^+\to K^0_Sπ^+η)=(1.309\pm0.037_{\rm stat}\pm0.031_{\rm syst})\%$。我们还确定了$CP$不对称的六个衰变的最高事件收益。没有发现PDMATHBNG违规的证据。

英文摘要：

Using $2.93\,\rm fb^{-1}$ of $e^+e^-$ collision data taken at a center-of-mass energy of 3.773\,GeV with the BESIII detector, we report the first measurements of the absolute branching fractions of fourteen hadronic $D^{0(+)}$ decays to exclusive final states with an $η$, e.g., $D^0\to K^-π^+η$, $K^0_Sπ^0η$, $K^+K^-η$, $K^0_SK^0_Sη$, $K^-π^+π^0η$, $K^0_Sπ^+π^-η$, $K^0_Sπ^0π^0η$, and $π^+π^-π^0η$; $D^+\to K^0_Sπ^+η$, $K^0_SK^+η$, $K^-π^+π^+η$, $K^0_Sπ^+π^0η$, $π^+π^+π^-η$, and $π^+π^0π^0η$. Among these decays, the $D^0\to K^-π^+η$ and $D^+\to K^0_Sπ^+η$ decays have the largest branching fractions, which are $\mathcal{B} (D^0\to K^-π^+η)=(1.853\pm0.025_{\rm stat}\pm0.031_{\rm syst})\%$ and $\mathcal{B}(D^+\to K^0_Sπ^+η)=(1.309\pm0.037_{\rm stat}\pm0.031_{\rm syst})\%$, respectively. We also determine the $CP$ asymmetries for the six decays with highest event yields. No evidence of $CP$ violation is found.

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