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arXiv 2602.09684hep-ph
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S波顶介子

The S-wave topped meson

Liaoning Normal University（辽宁师范大学）

Jun-Hao Zhang, Shuo Yang, Bing-Dong Wan

备注：
18 pages, 5 figures, and 1 table. Accepted by CPC
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AI总结：

基于CMS和ATLAS在顶夸克对产生中发现的近阈值增强，利用瞬时Bethe-Salpeter形式研究含单个顶夸克的S波重轻系统（tq̄），发现其质量接近顶夸克质量，并讨论了可能的产生和衰变模式。

摘要：

受CMS和ATLAS最近报道的顶夸克对产生中近阈值增强的启发，我们在瞬时Bethe-Salpeter形式下研究了含单个顶夸克的重轻系统的S波谱结构，即$t\ar{q}$、$t\ar{c}$和$t\ar{b}$。由于顶夸克的衰变时间尺度远小于典型的强子化时间，我们获得的离散本征值应被解释为可能的准束缚重轻构型的模型依赖参考位置，而非完全形成的传统强子的预测。数值结果表明，这些构型的质量接近顶夸克质量。对于$t\ar{b}$系统，前四个S波$0^{-}$径向态的质量分别约为顶夸克质量以上5.1、5.4、5.6和5.7 GeV。对于$t\ar{c}$系统，相应的值约为1.9、2.2、2.5和2.6 GeV。我们还定性地简要讨论了可能的产生和衰变模式，这可为未来专门的唯象学研究或实验约束提供参考。

英文摘要：

Motivated by the recent near-threshold enhancement in top-quark pair production reported by CMS and ATLAS, we study the S-wave spectral structure of heavy-light systems containing a single top quark, namely $t\bar{q}$, $t\bar{c}$, and $t\bar{b}$, within the instantaneous Bethe-Salpeter formalism. Because the top quark decays on a timescale much shorter than the typical hadronization time, the discrete eigenvalues we obtain should be interpreted as model-dependent reference positions of possible quasi-bound heavy-light configurations, rather than as predictions for fully formed conventional hadrons. The numerical results indicate that the masses of these configurations lie close to the top-quark mass. For the $t\bar{b}$ system, the masses of the first four S-wave $0^{-}$ radial states are about $5.1$, $5.4$, $5.6$, and $5.7$~GeV above the top-quark mass, respectively. For the $t\bar{c}$ system, the corresponding values are about $1.9$, $2.2$, $2.5$, and $2.6$~GeV. We also briefly discuss possible production and decay patterns at a qualitative level, which may serve as a reference for future dedicated phenomenological studies or for experimental constraints.

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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