论文标题
观察双重抑制的衰减$ d^+\ to k^+π^+π^-π^0 $和$ d^+\ to k^+ω$的证据
Observation of the Doubly Cabibbo-Suppressed Decay $D^+\to K^+π^+π^-π^0$ and Evidence for $D^+\to K^+ω$
论文作者
论文摘要
使用$ 2.93 \ rm fb^{ - 1}的$ e^+e^ - $ $ collision数据，以besiii检测器为3.773 GEV收集的碰撞数据，这是对doubly cabibbo抑制的$ d^+\ d^+\ to k^+ph^+ph^+ph^+ph^+publagibbo decay的首次观察。删除衰落后，包含狭窄的中间共振，包括$ d^+\ to k^+η$，$ d^+\ to k^+ω$，以及$ d^+\ to k^+ϕ $，decay $ d^+\ to k^+π^+π^+π^+π^-π^0 $的分支分支， \ pm 0.03 _ {\ rm syst}）\ times 10^{ - 3} $。 $ d^+\ \ \ k^+π^+π^-π^0 $上的分支分数的比率比$ d^+\与k^-π^+π^+π^0 $相比，发现为$（1.81 \ pm0.15）$ \％，该$ \％，$（6.28 \ pm0.52）混合角。该比率明显大于其他双重抑制衰变的相应比率。还确定了电荷偶联衰变的分支分数的不对称分数$ d^\ pm \ to k^\pmπ^\pmπ^\mpπ^0 $也是确定的，也找不到$ cp $违规的证据。此外，提出了$ d^+\ to k^+ω$衰减的第一个证据，统计意义为3.3 $σ$，并确定其衰减分支分数确定为$（{5.7^{+2.5} _ { - 2.1} _ { - 2.1}}} _ {\ rm Stat} _ {\ rm Stat} _ {\ rm Stat} \ rm pem0.2.2 _ { syst}）\ times10^{ - 5} $。
Using $2.93 \rm fb^{-1}$ of $e^+e^-$ collision data collected at a center-of-mass energy of 3.773 GeV with the BESIII detector, the first observation of the doubly Cabibbo-suppressed decay $D^+\to K^+π^+π^-π^0$ is reported. After removing decays that contain narrow intermediate resonances, including $D^+\to K^+η$, $D^+\to K^+ω$, and $D^+\to K^+ϕ$, the branching fraction of the decay $D^+\to K^+π^+π^-π^0$ is measured to be $(1.13 \pm 0.08_{\rm stat} \pm 0.03_{\rm syst})\times 10^{-3}$. The ratio of branching fractions of $D^+\to K^+π^+π^-π^0$ over $D^+\to K^-π^+π^+π^0$ is found to be $(1.81\pm0.15)$\%, which corresponds to $(6.28\pm0.52)\tan^4θ_C$, where $θ_C$ is the Cabibbo mixing angle. This ratio is significantly larger than the corresponding ratios for other doubly Cabibbo-suppressed decays. The asymmetry of the branching fractions of charge-conjugated decays $D^\pm\to K^\pmπ^\pmπ^\mpπ^0$ is also determined, and no evidence of $CP$ violation is found. In addition, the first evidence of the $D^+\to K^+ω$ decay, with a statistical significance of 3.3$σ$, is presented and its decay branching fraction is determined to be $({5.7^{+2.5}_{-2.1}}_{\rm stat}\pm0.2_{\rm syst})\times10^{-5}$.
