Two-pole structures in QCD -- a universal phenomenon governed by chiral dynamics
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866916674055176192 |
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| author | Xie, Jia-Ming Lu, Jun-Xu Geng, Li-Sheng Zou, Bing-Song |
| author_facet | Xie, Jia-Ming Lu, Jun-Xu Geng, Li-Sheng Zou, Bing-Song |
| contents | We illustrate how the two-pole structures of the $Λ(1405)$ emerge from the underlying universal chiral dynamics that describe the coupled-channel interactions between octet baryons and pseudo-Nambu-Goldstone bosons. Specifically, we attribute this phenomenon to the form of the leading-order chiral potential, which is of the Weinberg-Tomozawa type. We reveal how the underlying chiral dynamics can be exposed by examining the light-quark mass evolution of the two poles. The latest lattice QCD simulations have indeed found evidence for the existence of the two poles of $Λ(1405)$, in qualitative agreement with our predictions. We briefly mention a recent work in which lattice QCD simulations are studied more quantitatively, along with a proposal for how the SU(3) flavor content of the two poles of $Λ(1405)$ can be experimentally verified. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_03392 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Two-pole structures in QCD -- a universal phenomenon governed by chiral dynamics Xie, Jia-Ming Lu, Jun-Xu Geng, Li-Sheng Zou, Bing-Song High Energy Physics - Phenomenology High Energy Physics - Lattice We illustrate how the two-pole structures of the $Λ(1405)$ emerge from the underlying universal chiral dynamics that describe the coupled-channel interactions between octet baryons and pseudo-Nambu-Goldstone bosons. Specifically, we attribute this phenomenon to the form of the leading-order chiral potential, which is of the Weinberg-Tomozawa type. We reveal how the underlying chiral dynamics can be exposed by examining the light-quark mass evolution of the two poles. The latest lattice QCD simulations have indeed found evidence for the existence of the two poles of $Λ(1405)$, in qualitative agreement with our predictions. We briefly mention a recent work in which lattice QCD simulations are studied more quantitatively, along with a proposal for how the SU(3) flavor content of the two poles of $Λ(1405)$ can be experimentally verified. |
| title | Two-pole structures in QCD -- a universal phenomenon governed by chiral dynamics |
| topic | High Energy Physics - Phenomenology High Energy Physics - Lattice |
| url | https://arxiv.org/abs/2504.03392 |