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| Natura: | Preprint |
| Pubblicazione: |
2026
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| Accesso online: | https://arxiv.org/abs/2601.15795 |
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| _version_ | 1866918299618508800 |
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| author | Gushiken, Erick Hyodo, Tetsuo |
| author_facet | Gushiken, Erick Hyodo, Tetsuo |
| contents | We investigate the effect of decay channels on the near-threshold mass scaling by employing potential models. By varying the attractive strength of a square-well potential, we examine the pole trajectory associated with the transition of an $s$-wave bound state into a resonance state, incorporating decay-channel effects through both a single-channel complex potential model and a coupled-channel real potential model. As a result, we show that the pole of a quasibound state below the threshold is not continuously connected to that of a resonance state above the threshold. Furthermore, by comparing the results obtained from the single-channel and coupled-channel models, we clarify the correspondence between the pole trajectories in the two approaches. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_15795 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Decay Effect on Near-Threshold Mass Scaling with Complex and Coupled-Channel Potentials Gushiken, Erick Hyodo, Tetsuo High Energy Physics - Phenomenology Nuclear Theory We investigate the effect of decay channels on the near-threshold mass scaling by employing potential models. By varying the attractive strength of a square-well potential, we examine the pole trajectory associated with the transition of an $s$-wave bound state into a resonance state, incorporating decay-channel effects through both a single-channel complex potential model and a coupled-channel real potential model. As a result, we show that the pole of a quasibound state below the threshold is not continuously connected to that of a resonance state above the threshold. Furthermore, by comparing the results obtained from the single-channel and coupled-channel models, we clarify the correspondence between the pole trajectories in the two approaches. |
| title | Decay Effect on Near-Threshold Mass Scaling with Complex and Coupled-Channel Potentials |
| topic | High Energy Physics - Phenomenology Nuclear Theory |
| url | https://arxiv.org/abs/2601.15795 |