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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/2503.10315 |
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Table of Contents:
- In experiments exotic meson resonance $T_{c\bar c}(4020)$ lies above the $D^{*}\bar{D}^{*}$ threshold, and in principle one can not explain $T_{c\bar c}(4020)$ as a meson-meson bound state because meson-meson bound state must lie below the $D^{*}\bar{D}^{*}$ threshold. In this work, exotic resonance $T_{c\bar c}(4020)$ is considered as an unstable meson-meson molecular state $D^{*}\bar{D}^{*}$, and the developed Bethe-Salpeter theory for dealing with unstable state is applied to investigate resonance $T_{c\bar c}(4020)$. We calculate the mass and width of unstable meson-meson molecular state $D^{*}\bar{D}^{*}$ in the framework of relativistic quantum field theory and find that this unstable meson-meson molecular state lies above the $D^{*}\bar{D}^{*}$ threshold, which is consistent with experimental values of resonance $T_{c\bar c}(4020)$.