Structure of near-threshold resonances with new interpretation scheme of complex compositeness
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arXiv
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866909310705991680 |
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| author | Kinugawa, Tomona Hyodo, Tetsuo |
| author_facet | Kinugawa, Tomona Hyodo, Tetsuo |
| contents | The nature of near-threshold resonances is quantitatively studied with a new interpretation scheme using the complex compositeness. A difficulty was known in the understanding of the internal structure of unstable resonances because their complex compositeness is not an interpretable measure. To overcome this problem, we develop a new interpretation scheme respecting the ambiguous aspects of the identification of the internal structure of resonances. We then apply the interpretation scheme to the near-threshold resonances slightly above the threshold, described by the effective range expansion. With the new interpretation scheme, we show that near-threshold resonances are dominated by the non-molecular component. Namely, even in the near-threshold region, the nature of resonances is sharply contrasted with bound states whose internal structure is usually molecular dominant. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_06440 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Structure of near-threshold resonances with new interpretation scheme of complex compositeness Kinugawa, Tomona Hyodo, Tetsuo High Energy Physics - Phenomenology Nuclear Theory The nature of near-threshold resonances is quantitatively studied with a new interpretation scheme using the complex compositeness. A difficulty was known in the understanding of the internal structure of unstable resonances because their complex compositeness is not an interpretable measure. To overcome this problem, we develop a new interpretation scheme respecting the ambiguous aspects of the identification of the internal structure of resonances. We then apply the interpretation scheme to the near-threshold resonances slightly above the threshold, described by the effective range expansion. With the new interpretation scheme, we show that near-threshold resonances are dominated by the non-molecular component. Namely, even in the near-threshold region, the nature of resonances is sharply contrasted with bound states whose internal structure is usually molecular dominant. |
| title | Structure of near-threshold resonances with new interpretation scheme of complex compositeness |
| topic | High Energy Physics - Phenomenology Nuclear Theory |
| url | https://arxiv.org/abs/2409.06440 |