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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2510.01564 |
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| _version_ | 1866915530580951040 |
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| author | Yang, Zhi Wang, Guang-Juan Wu, Jia-Jun Oka, Makoto |
| author_facet | Yang, Zhi Wang, Guang-Juan Wu, Jia-Jun Oka, Makoto |
| contents | The $T_{c\bar{s}}$ state observed in the decay $D_{s1}(2460)^+ \to D_s^+π^+π^-$ provides direct evidence for an isovector open-charm tetraquark state with strangeness. We develop a unified theoretical framework that consistently incorporates triangle loops and $DK$-$D_sπ$ rescattering. Especially, $DK$-$D_sπ$ coupled-channel interactions through off-diagonal potential terms provide a novel perspective on the origin of the $T_{c\bar{s}}$ pole. Based on the systematic description of the $D_{s1}$ mass spectrum, the two-peak structure in $D_{s1}(2460)$ decay is perfectly reproduced, and explained by the interference of the $f_0$ resonance and rescattering diagrams. In contrast, only one-peak structure is predicted in $D_{s1}(2536)$ decay, since it is dominated by rescattering only. This difference originates from the $S$- and $D$-wave dominance for $D_{s1}(2460)$ and $D_{s1}(2536)$ coupling with $D^*K$ channel, respectively, which reflects the internal structures of the two $D_{s1}$ states. This unified approach demonstrates how decay and production mechanisms encode different aspects of dynamics, offering an opportunity to disentangle the nature of exotic hadrons. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_01564 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Coupled-Channel Dynamics of $T_{c\bar{s}}$ in $D_{s1}(2460/2536)\to D_sππ$ Yang, Zhi Wang, Guang-Juan Wu, Jia-Jun Oka, Makoto High Energy Physics - Phenomenology High Energy Physics - Experiment The $T_{c\bar{s}}$ state observed in the decay $D_{s1}(2460)^+ \to D_s^+π^+π^-$ provides direct evidence for an isovector open-charm tetraquark state with strangeness. We develop a unified theoretical framework that consistently incorporates triangle loops and $DK$-$D_sπ$ rescattering. Especially, $DK$-$D_sπ$ coupled-channel interactions through off-diagonal potential terms provide a novel perspective on the origin of the $T_{c\bar{s}}$ pole. Based on the systematic description of the $D_{s1}$ mass spectrum, the two-peak structure in $D_{s1}(2460)$ decay is perfectly reproduced, and explained by the interference of the $f_0$ resonance and rescattering diagrams. In contrast, only one-peak structure is predicted in $D_{s1}(2536)$ decay, since it is dominated by rescattering only. This difference originates from the $S$- and $D$-wave dominance for $D_{s1}(2460)$ and $D_{s1}(2536)$ coupling with $D^*K$ channel, respectively, which reflects the internal structures of the two $D_{s1}$ states. This unified approach demonstrates how decay and production mechanisms encode different aspects of dynamics, offering an opportunity to disentangle the nature of exotic hadrons. |
| title | Coupled-Channel Dynamics of $T_{c\bar{s}}$ in $D_{s1}(2460/2536)\to D_sππ$ |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2510.01564 |