The S-wave topped meson
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866914319118106624 |
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| author | Zhang, Jun-Hao Yang, Shuo Wan, Bing-Dong |
| author_facet | Zhang, Jun-Hao Yang, Shuo Wan, Bing-Dong |
| contents | Inspired by the recent observation of the near-threshold enhancement in top-quark pair production by CMS and ATLAS, we investigate the mass spectrum of S-wave topped meson which containing a single top quark, i.e., $t\bar{q}$, $t\bar{c}$, and $t\bar{b}$, in the framework of Bethe-Salpeter formalism. These states are expected to exhibit significantly enhanced lifetimes and correspondingly narrower decay widths compared to toponium, primarily because only a single top quark participates in the weak decay process. The numerical results indicate that the masses of topped mesons are close to the top-quark mass. For the $t\bar{b}$ states, the $1S$ state is approximately 5.08~GeV heavier than the top quark, while the $2S$, $3S$, and $4S$ states are about 5.37~GeV, 5.57~GeV, and 5.74~GeV heavier, respectively. For the $t\bar{c}$ states, the corresponding mass differences are 1.90~GeV, 2.23~GeV, 2.45~GeV, and 2.60~GeV. The possible production and decay properties are also analyzed, which could be measured in LHC experiments. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2602_09684 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | The S-wave topped meson Zhang, Jun-Hao Yang, Shuo Wan, Bing-Dong High Energy Physics - Phenomenology Inspired by the recent observation of the near-threshold enhancement in top-quark pair production by CMS and ATLAS, we investigate the mass spectrum of S-wave topped meson which containing a single top quark, i.e., $t\bar{q}$, $t\bar{c}$, and $t\bar{b}$, in the framework of Bethe-Salpeter formalism. These states are expected to exhibit significantly enhanced lifetimes and correspondingly narrower decay widths compared to toponium, primarily because only a single top quark participates in the weak decay process. The numerical results indicate that the masses of topped mesons are close to the top-quark mass. For the $t\bar{b}$ states, the $1S$ state is approximately 5.08~GeV heavier than the top quark, while the $2S$, $3S$, and $4S$ states are about 5.37~GeV, 5.57~GeV, and 5.74~GeV heavier, respectively. For the $t\bar{c}$ states, the corresponding mass differences are 1.90~GeV, 2.23~GeV, 2.45~GeV, and 2.60~GeV. The possible production and decay properties are also analyzed, which could be measured in LHC experiments. |
| title | The S-wave topped meson |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2602.09684 |