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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2403.12635 |
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| _version_ | 1866909275762196480 |
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| author | Kinugawa, Tomona Hyodo, Tetsuo |
| author_facet | Kinugawa, Tomona Hyodo, Tetsuo |
| contents | The near-threshold clustering phenomenon is well understood by the low-energy universality, for shallow bound states below the threshold. Nevertheless, the characteristics of resonances slightly above the threshold still lack thorough elucidation. We introduce a novel probabilistic interpretation scheme for complex compositeness of resonances, in which resonances with unphysically large decay widths are inherently excluded. Employing this scheme to analyze resonances via the effective range expansion, we demonstrate that near-threshold resonances have small composite fraction, in sharp contrast to shallow bound states below the threshold. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_12635 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Compositeness of near-threshold $s$-wave resonances Kinugawa, Tomona Hyodo, Tetsuo High Energy Physics - Phenomenology Nuclear Theory The near-threshold clustering phenomenon is well understood by the low-energy universality, for shallow bound states below the threshold. Nevertheless, the characteristics of resonances slightly above the threshold still lack thorough elucidation. We introduce a novel probabilistic interpretation scheme for complex compositeness of resonances, in which resonances with unphysically large decay widths are inherently excluded. Employing this scheme to analyze resonances via the effective range expansion, we demonstrate that near-threshold resonances have small composite fraction, in sharp contrast to shallow bound states below the threshold. |
| title | Compositeness of near-threshold $s$-wave resonances |
| topic | High Energy Physics - Phenomenology Nuclear Theory |
| url | https://arxiv.org/abs/2403.12635 |