夸克模型中和格点上的非猝灭和单生介子
Unquenching and unitarising mesons in quark models and on the lattice
摘要：
质量低于OZI允许的最低强衰变阈值的介子具有非常小的宽度。因此，通常认为它们可以安全地在光谱模型中被视为纯夸克-反夸克束缚态。然而，几十年前的unitarised和耦合通道模型已经表明，这可能不是事实，因为重要的虚拟介子环的贡献。最近的非猝灭晶格计算，包括两个介子插值除了通常的$q\bar{q}$的确认后一个结论，特别是对神秘的窄$D_{s0}^\star(2317)$，$D_{s1}(2460)$，和$X(3872)$状态。在这里，我们简要地回顾了一些旧的和新的夸克模型的预测，超越了介子的静态描述，并与最新的晶格结果进行了比较。
英文摘要：
Mesons with masses below their lowest OZI-allowed strong-decay thresholds have very small widths. Thus, it is usually believed that they can be safely treated as pure quark-antiquark bound states in spectroscopy models. However, unitarised and coupled-channel models from decades ago already indicated that this may not be the case, owing to significant virtual meson-loop contributions. Recent unquenched lattice calculations that include two-meson interpolators besides the usual $q\bar{q}$ ones confirm the latter conclusion, in particular for the enigmatic narrow $D_{s0}^\star(2317)$, $D_{s1}(2460)$, and $X(3872)$ states. Here, we briefly review some predictions of some old and new quark models that go beyond the static description of mesons, also in comparison with up-to-date lattice results.
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