共价键和粒子光谱学之间的一个有用的类比
A helpful analogy between the covalent bond and Particle Spectroscopy
摘要：
提出了介子共振是q-qbar和介子-介子（MM）的线性组合，重子共振是qqq和介子-重子（MB）的线性组合。这些组合之间的混合通过受限态衰变到介子-介子或介子-重子而产生。这与分子物理学中的共价键有一个精确的类比;它有助于可视化物理上发生的事情。一个本征态因混合而降低，另一个则向上移动，通常宽度会增加。尖点在阈值处出现。在尖锐的阈值，由于S波2粒子衰变，这些尖点在许多数据集中起着显着的作用。轻介子的整体模式与近似线性的Regge轨迹一致，因此是q-qbar分量。没有明显的理由说明为什么这种模式应该出现在没有q-qbar内容的动态生成的状态中。
英文摘要：
It is proposed that meson resonances are linear combinations of q-qbar and meson-meson (MM); baryon resonances are combinations of qqq and meson-baryon (MB). Mixing between these combinations arises via decays of confined states to meson-meson or meson-baryon. There is a precise analogy with the covalent bond in molecular physics; it helps to visualise what is happening physically. One eigenstate is lowered by the mixing; the other moves up and normally increases in width. Cusps arise at thresholds. At sharp thresholds due to S-wave 2-particle decays, these cusps play a conspicuous role in many sets of data. The overall pattern of light mesons is consistent with nearly linear Regge trajectories, hence q-qbar components. There is no obvious reason why this pattern should arise from dynamically generated states without q-qbar content.
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