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arXiv 1907.04475hep-phhep-exnucl-exnucl-th
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$Λ_c^+\to K^-pπ^+$和$Λ_c^+\to K^0_Spπ^0 $中超子的产生

Hyperon production in $Λ_c^+\to K^-pπ^+$ and $Λ_c^+\to K^0_Spπ^0 $

Jung Keun Ahn, Seongbae Yang, Seung-il Nam

备注：
8 pages, 8 figures
发表信息：
Phys. Rev. D 100, 034027 (2019)
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摘要：

我们在有效拉格朗日方法下研究了$S=-1$超子从$Λ_c^+\to K^-pπ^+$和$Λ_c^+\to K^0_Spπ^0$衰变中的产生。我们认为$Σ/Λ$基态，$Λ(1520)$，$Λ(1670)(J^p=1/2^-)$，$Λ(1890)(J^p=3/2^+)$ ; $Λ/Σ$ -极的贡献，从1800 MeV和2100 MeV之间的组合共振;和$N/Δ$ -极和$K^\ast$ -极的贡献，其中包括质子，$Δ(1232)$，和$K(892)$。我们计算了$Λ_c^+\to K^-pπ^+$衰变的Dalitz图密度（$(d^2Γ/dM_{K^-p}dM_{K^-π^+}$）。计算结果与Belle协作组的实验数据吻合较好。使用拟合的参数，我们给出了$Λ_c^+\to K^0_Spπ^0$衰变的Dalitz图密度。在我们的计算中，由于$Λ(1670)$共振和$η$-$Λ$环通道之间的干扰效应，在$Λ_c^+\to K^-pπ^+$衰变中预测了在1665 MeV附近的尖峰状结构。我们还表明，我们可以直接访问有关弱耦合的$Λ(1670)$和$Σ(1670)$从$Λ_c^+\to K^0_Spπ^0$衰变的信息。最后，我们的预测之外的1665 MeV结构的可能解释进行了简要讨论。

英文摘要：

We investigate $S=-1$ hyperon production from the $Λ_c^+\to K^-pπ^+$ and $Λ_c^+\to K^0_Spπ^0$ decays within the effective Lagrangian approach. We consider the $Σ/Λ$ ground states, $Λ(1520)$, $Λ(1670)(J^p=1/2^-)$, $Λ(1890)(J^p=3/2^+)$; $Λ/Σ$-pole contributions from the combined resonances between 1800 MeV and 2100 MeV; and $N/Δ$-pole and $K^\ast$-pole contributions, which include the proton, $Δ(1232)$, and $K(892)$. We calculate the Dalitz plot density $(d^2Γ/dM_{K^-p}dM_{K^-π^+}$) for the $Λ_c^+\to K^-pπ^+$ decay. The calculated result is in good agreement with experimental data from the Belle Collaboration. Using the parameters from the fit, we present the Dalitz plot density for the $Λ_c^+\to K^0_Spπ^0$ decay. In our calculation, a sharp peak-like structure near 1665 MeV is predicted in the $Λ_c^+\to K^-pπ^+$ decay because of the interference effects between the $Λ(1670)$ resonance and $η$-$Λ$ loop channels. We also demonstrate that we can access direct information regarding the weak couplings of $Λ(1670)$ and $Σ(1670)$ from the $Λ_c^+\to K^0_Spπ^0$ decay. Finally, a possible interpretation for the 1665 MeV structure beyond our prediction is briefly discussed.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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