论文标题
$λ_{C}^{+} \rightArrowηλπ^{+} $，$ης^{0}π^{+} $，$λ（1670）π^{+} $，$λ_{+}的分支分数的测量
Measurement of Branching Fractions of $Λ_{c}^{+} \rightarrow ηΛπ^{+}$, $ηΣ^{0} π^{+}$, $Λ(1670) π^{+}$, and $ηΣ(1385)^{+}$
论文作者
论文摘要
我们报告了$λ_{c}^{+} $ baryon的四个衰减模式的分支分数测量，每种都包括$η$梅森和最终状态下的$λ$ baryon，所有这些都相对于$λ_{c}^{c}^{+}^{+rightarrow p k^^$ verney as close 结果基于$ 980〜 \ mathrm {fb^{ - 1}} $数据样本由Belle检测器在KEKB非对称 - 能量$ e^{+} e^{ - } $ collider上收集。 两个衰败，$ης^{0}π^{+} $和$λ（1670）π^{+} $是第一次观察，而其他衰减模式的测量值为$λ_{c}^c}^{+}^{+rightArrow precise untarrow preciseuntarrowηλπ以前做过。 我们获得$ \ MATHCAL {B}（λ_{C}^{+} \rightArroWηλπ^{+}） $ \ MATHCAL {B}（λ_{C}^{+} \rightarrowης^{0}π^{+}）/\ Mathcal {b}（λ_{c}^{c}^{+}^{+rightArrow p k^p k^p k^{ - } { - } { - 0.00 0006 $ \ MATHCAL {B}（λ_{C}^{+} \rightArrowλ（1670）π^{+}）\ times \ times \ times \ Mathcal {b}（λ（λ（1670）\ rightArrow \ rightarrowηλ） π^{+}）$ = $ = $（5.54 \ pm 0.29 \ pm 0.73）\ times 10^{ - 2} $，和$ \ Mathcal {b}（λ_{c}^{c}^{+} {+} {+} \ rightArrow prirctarrow prirestarrow prirestArrow prientarrow prientArrow prientarrow prientarrow prientarrow prightarrow prightarrow prightarrow} \ rightarrow p k^{ - }π^{+}）$ = $ 0.192 \ pm 0.006 \ pm 0.016 $。 $λ（1670）$的质量和宽度也被确切确定为$ 1674.3 \ pm 0.8 \ pm 4.9〜 {\ rm mev}/c^{2} $和$ 36.1 \ pm 2.4 \ pm 2.4 \ pm 4.8〜 {\ rm mev} $分别是无与伦比的，是属于统计的，分别是统计的。
We report branching fraction measurements of four decay modes of the $Λ_{c}^{+}$ baryon, each of which includes an $η$ meson and a $Λ$ baryon in the final state, and all of which are measured relative to the $Λ_{c}^{+} \rightarrow p K^{-} pi^{+}$ decay mode. The results are based on a $980~\mathrm{fb^{-1}}$ data sample collected by the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider. Two decays, $ηΣ^{0} π^{+}$ and $Λ(1670) π^{+}$, are observed for the first time, while the measurements of the other decay modes, $Λ_{c}^{+} \rightarrow ηΛπ^{+}$ and $ηΣ(1385)^{+}$, are more precise than those made previously. We obtain $\mathcal{B}(Λ_{c}^{+} \rightarrow ηΛπ^{+})/\mathcal{B}(Λ_{c}^{+} \rightarrow p K^{-} π^{+})$ = $0.293 \pm 0.003 \pm 0.014$, $\mathcal{B}(Λ_{c}^{+} \rightarrow ηΣ^{0} π^{+})/\mathcal{B}(Λ_{c}^{+} \rightarrow p K^{-} π^{+})$ = $0.120 \pm 0.006 \pm 0.006$, $\mathcal{B}(Λ_{c}^{+} \rightarrow Λ(1670) π^{+}) \times \mathcal{B}(Λ(1670) \rightarrow ηΛ)/\mathcal{B}(Λ_{c}^{+} \rightarrow p K^{-} π^{+})$ = $(5.54 \pm 0.29 \pm 0.73 ) \times 10^{-2}$, and $\mathcal{B}(Λ_{c}^{+} \rightarrow ηΣ(1385)^{+})/\mathcal{B}(Λ_{c}^{+} \rightarrow p K^{-} π^{+})$ = $0.192 \pm 0.006 \pm 0.016$. The mass and width of the $Λ(1670)$ are also precisely determined to be $1674.3 \pm 0.8 \pm 4.9~{\rm MeV}/c^{2}$ and $36.1 \pm 2.4 \pm 4.8~{\rm MeV}$, respectively, where the uncertainties are statistical and systematic, respectively.
