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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/2510.23958 |
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| _version_ | 1866911686662815744 |
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| author | Li, Haoran Wang, Ziyue |
| author_facet | Li, Haoran Wang, Ziyue |
| contents | We investigate the spectral functions of neutral and charged mesons in a hot dense medium under a external magnetic field using the two-flavor quark-meson model within the functional renormalization group (FRG) framework. Our results show that the spectral functions of σ and π0 mesons develop new structures due to decay channels into quarks occupying different Landau levels. By consistently incorporating the momentum relations at vertices for charged particles in a magnetic field, we further show that the π+ spectral function develops a multi-peak structure at finite temperatures, resulting from the various annihilation and decay channels available to π+ in the magnetic environment. This multi-peak structure is further enhanced in a finite-density medium, causing the π+ meson to become a broad resonance at lower temperatures and densities compared to neutral mesons. Such a multi-peak pattern is expected to be universal for charged mesons under magnetic fields and carries significant implications for understanding transport properties in magnetized strongly interacting fluids |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_23958 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Multi-peak structure of meson spectral function in magnetic field Li, Haoran Wang, Ziyue Nuclear Theory We investigate the spectral functions of neutral and charged mesons in a hot dense medium under a external magnetic field using the two-flavor quark-meson model within the functional renormalization group (FRG) framework. Our results show that the spectral functions of σ and π0 mesons develop new structures due to decay channels into quarks occupying different Landau levels. By consistently incorporating the momentum relations at vertices for charged particles in a magnetic field, we further show that the π+ spectral function develops a multi-peak structure at finite temperatures, resulting from the various annihilation and decay channels available to π+ in the magnetic environment. This multi-peak structure is further enhanced in a finite-density medium, causing the π+ meson to become a broad resonance at lower temperatures and densities compared to neutral mesons. Such a multi-peak pattern is expected to be universal for charged mesons under magnetic fields and carries significant implications for understanding transport properties in magnetized strongly interacting fluids |
| title | Multi-peak structure of meson spectral function in magnetic field |
| topic | Nuclear Theory |
| url | https://arxiv.org/abs/2510.23958 |