Review on recent progress in the study of the $N^*(920)$ subthreshold singularity and the $σ/f_0(500)$ meson
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866918232864063488 |
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| author | Li, Qu-Zhi Xiao, Zhiguang Zheng, Han-Qing |
| author_facet | Li, Qu-Zhi Xiao, Zhiguang Zheng, Han-Qing |
| contents | We summarize recent results on studies of $ππ$ and $πN$ scatterings. They include the finding of a negative-parity nucleon pole with a mass lower than the nucleon mass, and the pole trajectory of $f_0(500)$ as the pion mass varies. The results are obtained from model-independent dispersion analyses. We also study the thermal properties of $f_0(500)$ based on the $O(N)$ $σ$ model and $N/D$ method. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_24674 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Review on recent progress in the study of the $N^*(920)$ subthreshold singularity and the $σ/f_0(500)$ meson Li, Qu-Zhi Xiao, Zhiguang Zheng, Han-Qing High Energy Physics - Phenomenology High Energy Physics - Lattice Nuclear Theory We summarize recent results on studies of $ππ$ and $πN$ scatterings. They include the finding of a negative-parity nucleon pole with a mass lower than the nucleon mass, and the pole trajectory of $f_0(500)$ as the pion mass varies. The results are obtained from model-independent dispersion analyses. We also study the thermal properties of $f_0(500)$ based on the $O(N)$ $σ$ model and $N/D$ method. |
| title | Review on recent progress in the study of the $N^*(920)$ subthreshold singularity and the $σ/f_0(500)$ meson |
| topic | High Energy Physics - Phenomenology High Energy Physics - Lattice Nuclear Theory |
| url | https://arxiv.org/abs/2505.24674 |