论文标题
$λ_{c}^{+} $在besiii衰减
$Λ_{c}^{+}$ decays at BESIII
论文作者
论文摘要
BESIII在获取数据方面取得了长足的进步，这是$λ_{C}^{+} \barλ_{c}^{ - } $ threshold的最大数据样本。我们已经测量了$λ_{c}^{+} \ tonπ^{+} $的分支分数为$（6.6 \ pm 1.2 _ {\ mathrm {stat。 $ 3.9 \ mathrm {fb}^{ - 1} $ $ e^{+} e^{ - } $在4.612和4.699 GEV之间与besiii检测器收集的collision collision collision collision collision collision collision collision collision collision collision collision collision collision collision collision collision collision collision collision collision collision collision collision collision collision collision collision collision。从Belle的$λ_{C}^{+} \至Pπ^{0} $的分支分数的结果，$λ_{c}^{+}^{+} \ tonπ^{+} $和$λ__{c}^iS的分支分数比90％的置信度。 $λ_{c}^{+} \toλπ^{+} $和$λ_{c}^{+} \ toσ^{0}π^{+} $的分支级分。 0.05_{\mathrm{syst.}})\times 10^{-2}$ and $(1.22\pm 0.08_{\mathrm{stat.}}\pm 0.07_{\mathrm{syst.}})\times 10^{-2}$, respectively, which are consistent with previous BESIII results. $λ_{c}^{+} $衰减的更多结果将在今年使用$ 6.4 \ mathrm {fb}^{ - 1} $ $ e^{+} e^{ - } $ collision collision数据样本在4.600和4.946 gev之间发表。
BESIII has made great progress in taking data which is the largest data samples near the $Λ_{c}^{+}\barΛ_{c}^{-}$ threshold. We have measured the branching fraction of $Λ_{c}^{+}\to nπ^{+}$ to be $(6.6\pm 1.2_{\mathrm{stat.}}\pm 0.4_{\mathrm{syst.}})\times 10^{-4}$ with the statistical significance of 7.3 $σ$ firstly using $3.9\mathrm{fb}^{-1}$ $e^{+}e^{-}$ collision collected with BESIII detector at six center-of-mass energies between 4.612 and 4.699 GeV. With the result of the branching fraction of $Λ_{c}^{+}\to pπ^{0}$ from Belle, the ratio of the branching fractions between $Λ_{c}^{+}\to nπ^{+}$ and $Λ_{c}^{+}\to pπ^{0}$ is measured to be larger than 7.2 at 90% confidence level. The branching fractions of $Λ_{c}^{+}\to Λπ^{+}$ and $Λ_{c}^{+}\to Σ^{0} π^{+}$ are measured to be $(1.31\pm 0.08_{\mathrm{stat.}}\pm 0.05_{\mathrm{syst.}})\times 10^{-2}$ and $(1.22\pm 0.08_{\mathrm{stat.}}\pm 0.07_{\mathrm{syst.}})\times 10^{-2}$, respectively, which are consistent with previous BESIII results. More results of $Λ_{c}^{+}$ decays will be published with better precision this year using $6.4\mathrm{fb}^{-1}$ $e^{+}e^{-}$ collision data samples between 4.600 and 4.946 GeV.
