论文标题
$λ_C（2625）^+$的质量和宽度和$λ_C（2625）^+\toσ_c^{0}π^{+} $和$λ_C（2625）
Measurement of the mass and width of the $Λ_c(2625)^+$ and the branching ratios of $Λ_c(2625)^+ \to Σ_c^{0}π^{+}$ and $Λ_c(2625)^+ \to Σ_c^{++}π^{-}$
论文作者
论文摘要
使用$ 980 \，\ textrm {fb}^{ - 1} $的整个数据样本，与在kekb非对称效能撞机上运行的百丽检测器收集，我们报告了质量，宽度，宽度，宽度的测量值，以及$λ_C（2625）^+$ charmed baryon的质量，宽度和相对分支比率。 $λ_C（2625）^+$和$λ_C^+$之间的质量差异为$ M（λ_C（2625）^{+}） - M（λ_C^{+}）= 341.518 \ pm 0.006 \ pm 0.006 \ pm 0.049 \ pm 0.049 \ \ \ \ \ \ \ \ \ \ m rm} $}宽度的上限为$γ（λ_c（2625）^+）<0.52 \，\ Mathrm {Mev}/\ textit {C}^2 $在90 \％可信度下。基于完整的dalitz图拟合，相对于模式$λ_C（2625）^+ \toλ_c^+π^+π^ - $的分支比率为$ \ frac {\ frac {\ nathcal {b} {\ Mathcal {b}（λ_c（2625）^+ \toλ_c^+π^{+}π^{ - }）} =（5.19 \ pm 0.23 \ pm 0.40）\％$和$ \ frac { π^{ - }）}} {\ Mathcal {b}（λ_c（2625）^+ \toλ_c^+π^{+}π^{ - }} =（5.13 \ pm 0.26 \ pm pm pm 0.32）\％$ $。这些测量值可用于进一步限制基本理论模型的参数。
Using the entire data sample of $980\,\textrm{fb}^{-1}$ collected with the Belle detector operating at the KEKB asymmetric-energy collider, we report the measurement of the mass, width, and the relative branching ratios of the $Λ_c(2625)^+$ charmed baryon. The mass difference between $Λ_c(2625)^+$ and $Λ_c^+$ is measured to be $M(Λ_c(2625)^{+}) - M(Λ_c^{+}) = 341.518 \pm 0.006 \pm 0.049\ \mathrm{MeV}/\mathit{c}^2$. The upper limit on the width is measured to be $Γ(Λ_c(2625)^+) < 0.52\,\mathrm{MeV}/\textit{c}^2$ at 90\% credibility level. Based on a full Dalitz plot fit, branching ratios with respect to the mode $Λ_c(2625)^+ \to Λ_c^+ π^+ π^-$ are measured to be $\frac{\mathcal{B}(Λ_c(2625)^+ \to Σ_c^{0} π^{+})} {\mathcal{B}(Λ_c(2625)^+ \to Λ_c^+ π^{+} π^{-})} = (5.19 \pm 0.23 \pm 0.40) \%$ and $\frac{\mathcal{B}(Λ_c(2625)^+ \to Σ_c^{++} π^{-})} {\mathcal{B}(Λ_c(2625)^+ \to Λ_c^+ π^{+} π^{-})} = (5.13 \pm 0.26 \pm 0.32) \%$. These measurements can be used to further constrain the parameters of the underlying theoretical models.
