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| Natura: | Preprint |
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2025
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| Accesso online: | https://arxiv.org/abs/2511.14380 |
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| _version_ | 1866918208177438720 |
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| author | Xie, Jia-Ming Liu, Zhi-Wei Lu, Jun-Xu Liang, Haozhao Molina, Raquel Geng, Li-Sheng |
| author_facet | Xie, Jia-Ming Liu, Zhi-Wei Lu, Jun-Xu Liang, Haozhao Molina, Raquel Geng, Li-Sheng |
| contents | We present a comprehensive study of the axial-vector resonance $K_1(1270)$ within the unitarized chiral perturbation theory, focusing on its two-pole structure and manifestation in femtoscopic observables. By considering the dominant $ρK$ and $K^*π$ coupled channels, we reproduce the well-established double-pole structure and trace the chiral evolution of both poles as functions of the pion mass, using the vector-meson mass trajectories fitted to lattice-QCD data and experimental values. The lower pole, dominantly coupled to $K^*π$, evolves from an above-threshold resonance to a virtual or bound state with increasing pion mass. In comparison, the higher pole, dominantly coupled to $ρK$, moves downward in energy, reflecting the strengthening of the chiral attraction. The influence of the finite vector-meson widths is systematically examined, showing that their inclusion smooths the pole trajectories without altering their qualitative behavior. Furthermore, femtoscopic CFs are calculated for all relevant vector-pseudoscalar channels in both charged sectors. The results exhibit distinct resonance and bound-state features consistent with the two-pole dynamics. The weak impact of higher channels, such as $ω\bar{K}$, $\bar{K}^*η$, and $ϕ\bar{K}$, confirms that the simplified two-channel treatment captures the essential dynamics of the $K_1(1270)$ resonance. This study demonstrates that combining chiral extrapolation and femtoscopic correlation analyses provides a powerful and complementary framework for connecting lattice-QCD calculations, chiral effective theory, and experimental measurements, offering new insights into the molecular nature and chiral origin of the $K_1(1270)$ resonance. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_14380 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Chiral Evolution and Femtoscopic Signatures of the $K_1(1270)$ Resonance Xie, Jia-Ming Liu, Zhi-Wei Lu, Jun-Xu Liang, Haozhao Molina, Raquel Geng, Li-Sheng High Energy Physics - Phenomenology We present a comprehensive study of the axial-vector resonance $K_1(1270)$ within the unitarized chiral perturbation theory, focusing on its two-pole structure and manifestation in femtoscopic observables. By considering the dominant $ρK$ and $K^*π$ coupled channels, we reproduce the well-established double-pole structure and trace the chiral evolution of both poles as functions of the pion mass, using the vector-meson mass trajectories fitted to lattice-QCD data and experimental values. The lower pole, dominantly coupled to $K^*π$, evolves from an above-threshold resonance to a virtual or bound state with increasing pion mass. In comparison, the higher pole, dominantly coupled to $ρK$, moves downward in energy, reflecting the strengthening of the chiral attraction. The influence of the finite vector-meson widths is systematically examined, showing that their inclusion smooths the pole trajectories without altering their qualitative behavior. Furthermore, femtoscopic CFs are calculated for all relevant vector-pseudoscalar channels in both charged sectors. The results exhibit distinct resonance and bound-state features consistent with the two-pole dynamics. The weak impact of higher channels, such as $ω\bar{K}$, $\bar{K}^*η$, and $ϕ\bar{K}$, confirms that the simplified two-channel treatment captures the essential dynamics of the $K_1(1270)$ resonance. This study demonstrates that combining chiral extrapolation and femtoscopic correlation analyses provides a powerful and complementary framework for connecting lattice-QCD calculations, chiral effective theory, and experimental measurements, offering new insights into the molecular nature and chiral origin of the $K_1(1270)$ resonance. |
| title | Chiral Evolution and Femtoscopic Signatures of the $K_1(1270)$ Resonance |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2511.14380 |