Opening the Parameter Space of sub-GeV Inelastic Dark Matter through Parity Violation
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arXiv
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| Autores principales: | , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866914205210247168 |
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| author | Garcia, Giovani Dalla Valle Herrero-García, Juan Jones-Pérez, Joel Silva-Malpartida, Javier |
| author_facet | Garcia, Giovani Dalla Valle Herrero-García, Juan Jones-Pérez, Joel Silva-Malpartida, Javier |
| contents | Sub-GeV dark matter (DM) has emerged as a particularly compelling target in light of the persistent null results from conventional DM searches. While s-wave annihilating DM candidates with masses below the GeV are strongly constrained by indirect-detection bounds, inelastic scenarios can naturally evade these limits. In this work, we show that parity violation can play an important role in inelastic DM models featuring long-lived excited states by inducing small diagonal couplings that significantly relax experimental constraints. A precise determination of the excited-state abundance is essential for assessing the phenomenology of such models. To this end, we solve the integrated Boltzmann equation, fully accounting for up- and down-scattering with electrons and positrons as well as dark-sector conversion processes. Using the resulting abundance, we update the viable parameter space in light of the most recent experimental constraints and demonstrate that parity-violating interactions can reopen broad regions of parameter space that would otherwise be excluded. Moreover, the forthcoming LDMX experiment will probe a significant portion of the parameter space. The framework developed in this work can be readily applied to other exothermic sub-GeV DM scenarios. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_14828 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Opening the Parameter Space of sub-GeV Inelastic Dark Matter through Parity Violation Garcia, Giovani Dalla Valle Herrero-García, Juan Jones-Pérez, Joel Silva-Malpartida, Javier High Energy Physics - Phenomenology Sub-GeV dark matter (DM) has emerged as a particularly compelling target in light of the persistent null results from conventional DM searches. While s-wave annihilating DM candidates with masses below the GeV are strongly constrained by indirect-detection bounds, inelastic scenarios can naturally evade these limits. In this work, we show that parity violation can play an important role in inelastic DM models featuring long-lived excited states by inducing small diagonal couplings that significantly relax experimental constraints. A precise determination of the excited-state abundance is essential for assessing the phenomenology of such models. To this end, we solve the integrated Boltzmann equation, fully accounting for up- and down-scattering with electrons and positrons as well as dark-sector conversion processes. Using the resulting abundance, we update the viable parameter space in light of the most recent experimental constraints and demonstrate that parity-violating interactions can reopen broad regions of parameter space that would otherwise be excluded. Moreover, the forthcoming LDMX experiment will probe a significant portion of the parameter space. The framework developed in this work can be readily applied to other exothermic sub-GeV DM scenarios. |
| title | Opening the Parameter Space of sub-GeV Inelastic Dark Matter through Parity Violation |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2512.14828 |