Improved liquid argon ionization model and its impact on the DarkSide low-mass WIMP search programme
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arXiv
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| Format: | Preprint |
| Published: |
2026
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| _version_ | 1866915757280985088 |
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| author | Franco, Davide |
| author_facet | Franco, Davide |
| contents | DarkSide-50 achieved leading WIMP limits down to 1.2 GeV/c2 with an ionization-only analysis, despite its small active mass of 46 kg compared to multi-ton noble-liquid detectors. Accurate modelling of the nuclear-recoil ionization yield (Qy) is central to interpreting such searches. A new global fit combining nuclear-recoil response measurements from DarkSide-50, ARIS, SCENE, and the recent ReD experiment constrains Qy between 0.4 and 150 keV within the Thomas-Imel box framework. The dependence on screening potentials is addressed through a Bayesian model comparison, which rejects the ZBL and Molière functions and strongly favours the Lenz-Jensen one. The resulting model improves DarkSide-50 sensitivity below 3 GeV/c2 and refines the DarkSide-20k sensitivity accordingly. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_00597 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Improved liquid argon ionization model and its impact on the DarkSide low-mass WIMP search programme Franco, Davide High Energy Physics - Experiment DarkSide-50 achieved leading WIMP limits down to 1.2 GeV/c2 with an ionization-only analysis, despite its small active mass of 46 kg compared to multi-ton noble-liquid detectors. Accurate modelling of the nuclear-recoil ionization yield (Qy) is central to interpreting such searches. A new global fit combining nuclear-recoil response measurements from DarkSide-50, ARIS, SCENE, and the recent ReD experiment constrains Qy between 0.4 and 150 keV within the Thomas-Imel box framework. The dependence on screening potentials is addressed through a Bayesian model comparison, which rejects the ZBL and Molière functions and strongly favours the Lenz-Jensen one. The resulting model improves DarkSide-50 sensitivity below 3 GeV/c2 and refines the DarkSide-20k sensitivity accordingly. |
| title | Improved liquid argon ionization model and its impact on the DarkSide low-mass WIMP search programme |
| topic | High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2601.00597 |