基于BESIII测量重新研究Λ_c^+→nπ^+η衰变
Revisiting the $Λ_c^+ \to nπ^+η$ decay in light of the BESIII measurement
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中文总结 AI 辅助
本研究结合BESIII测量，系统分析Λ_c^+→nπ^+η衰变的中间态贡献，明确a_0(980)的显著作用，指出需更高精度实验以揭示其性质及核子共振态的角色。
中文摘要 AI 辅助
受BESIII对Λ_c^+→nπ^+η衰变最新测量结果的驱动，我们对该衰变开展了系统理论研究。我们考虑了S波赝标量介子-八重态重子相互作用动态产生的N(1535)态、由S波赝标量介子-赝标量介子相互作用产生的a_0(980)共振，以及中间态N(1440)和a_2(1320)的贡献。结果表明，a_0(980)对该过程有显著贡献；加入a_2(1320)几乎未改善拟合质量，而核子共振态对描述π^+η不变质量谱在低能和高能区的实验行为至关重要。受实验统计量不足及33 MeV的粗分bin尺寸限制，无法可靠提取a_0(980)的精确贡献占比。我们建议未来对Λ_c^+→nπ^+η开展更高精度、更高统计量的实验测量，这将有助于揭示a_0(980)的内禀性质并量化不同激发核子态在该衰变中的作用。
英文摘要
Motivated by the latest BESIII measurements on $Λ_c^+\to nπ^+η$, we perform a systematic theoretical study of this decay. We take into account contributions from the $N(1535)$ state dynamically generated by $S$-wave pseudoscalar meson-octet baryon interactions, the $a_0(980)$ resonance originating from the $S$-wave pseudoscalar meson-pseudoscalar meson interactions, together with the intermediate states $N(1440)$ and $a_2(1320)$. Our results indicate that $a_0(980)$ provides a significant contribution to this process. The inclusion of $a_2(1320)$ hardly improves the fitting quality, while the nucleon resonances play a crucial role in describing the experimental behavior of the $π^+η$ invariant mass spectrum in both low and high energy regions. Restricted by insufficient experimental statistics and a coarse bin size of 33 MeV, the precise contribution fraction of $a_0(980)$ cannot be reliably extracted. We propose future higher-precision and higher-statistics experimental measurements of $Λ_c^+\to nπ^+η$, which can help reveal the intrinsic nature of $a_0(980)$ and quantify the roles of different excited nucleon states in this decay.
