COMPASS实验中额外的K(1690)信号作为一种奇特的混合态
$K(1690)$ signal from COMPASS as a strange hybrid state
- Anhui Science and Technology University（安徽科技学院）
- Lanzhou University（兰州大学）
- Institute of Modern Physics of CAS（中国科学院近代物理研究所）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
研究COMPASS实验中发现的K(1690)态，通过系统研究奇异介子谱及强衰变，结合其产生机制与π_1(1600)相似，将其视为0⁻奇异混合介子研究强衰变，支持其为混合态，还确定重要衰变模式并建议BESIII寻找该态。
AI中文摘要：
COMPASS合作组最近在K⁻ + p → K⁻π⁻π⁺ + p散射反应中发现了J^P = 0⁻的K(1690)态，在1.0 - 2.0 GeV区域观察到三个赝标奇异介子K(1460)、K(1690)和K(1830)。夸克模型预期该能量区域只有2^1S_0和3^1S_0奇异介子态。研究发现K(1460)和K(1830)分别是2^1S_0和3^1S_0奇异介子的良好候选者。K(1690)产生机制与被广泛认为是混合介子候选者的π_1(1600)相似，将其视为0⁻奇异混合介子，在组分胶子模型中研究其强衰变，结果支持它是混合态。还确定了K(1690)的重要衰变模式，并建议BESIII通过J/ψ→KK(1690)→KK⁺₀(1430)π→KKππ过程寻找K(1690)态。
英文摘要：
A pseudoscalar resonance structure, denoted as the $K(1690)$, was recently discovered by the COMPASS Collaboration in the scattering reaction $K^-+p\to K^-π^-π^++p$. If the $K(1690)$ is a genuine state, there are three observed pseudoscalar strange mesons, namely the $K(1460)$, $K(1690)$, and $K(1830)$, in the 1.0$-$2.0 GeV region. However, within the conventional quark model, only the $2^1S_0$ and $3^1S_0$ strange meson states are expected in this energy region. Therefore, at least one of these states should be interpreted as an exotic candidate. In this work, we study the spectrum of strange mesons systematically, and find that the $K(1460)$ and $K(1830)$ are good candidates of $2^1S_0$ and $3^1S_0$ strange mesons, respectively. A further investigation of their strong decays also supports this assignment. Furthermore, we note that the production mechanism of the $K(1690)$ is similar to that of the $π_1(1600)$, which has been widely regarded as a hybrid meson candidate. We investigate the strong decays of the $K(1690)$ within a constituent gluon model by treating it as a $0^-$ strange hybrid meson and find that the results support the $K(1690)$ as a hybrid state. Finally, we identify several important decay modes of the $K(1690)$ that may be used in future experiments to test whether it contains the $n^1S_0$ ($n=$2 and 3) $s\bar{q}$ component. We also suggest BESIII to search for the $K(1690)$ state through the $J/ψ\to K K(1690) \to KK^{\ast}_0(1430)π\to KKππ$ process.
