Characterizing CJPL's Site-Specific Neutrino Floor as the Neutrino Fog Boundary
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866912542797856768 |
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| author | Fan, Yingjie Liu, Xuewen Zhou, Ning |
| author_facet | Fan, Yingjie Liu, Xuewen Zhou, Ning |
| contents | The neutrino floor, a theoretical sensitivity limit for dark matter (DM) direct detections, is being redefined as the boundary of a dynamic ``neutrino fog", where neutrino signals become inevitable, obscuring DM detection due to the statistical and systematic uncertainties. This study provides the first site-specific analysis of the neutrino floor at China Jinping Underground Laboratory (CJPL), leveraging its unique geographic and environmental characteristics. We quantify how CJPL's suppressed atmospheric neutrino flux (around 30\% lower than Laboratori Nazionali del Gran Sasso (LNGS)) reshapes the neutrino floor, thereby enabling improved sensitivity to high-mass WIMPs (mass $>10 \rm GeV$). Using a gradient-based framework, we derive CJPL's neutrino floor and estimate the detection prospects for the PandaX-xT experiment. Our results demonstrate that a 500 tonne-year exposure with PandaX-xT could touch the floor, probing spin independent cross-section down to $σ_{n}\sim 3\times 10^{-49} \rm cm^2$ at a DM mass of 70 GeV/$c^2$. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2503_22155 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Characterizing CJPL's Site-Specific Neutrino Floor as the Neutrino Fog Boundary Fan, Yingjie Liu, Xuewen Zhou, Ning High Energy Physics - Phenomenology The neutrino floor, a theoretical sensitivity limit for dark matter (DM) direct detections, is being redefined as the boundary of a dynamic ``neutrino fog", where neutrino signals become inevitable, obscuring DM detection due to the statistical and systematic uncertainties. This study provides the first site-specific analysis of the neutrino floor at China Jinping Underground Laboratory (CJPL), leveraging its unique geographic and environmental characteristics. We quantify how CJPL's suppressed atmospheric neutrino flux (around 30\% lower than Laboratori Nazionali del Gran Sasso (LNGS)) reshapes the neutrino floor, thereby enabling improved sensitivity to high-mass WIMPs (mass $>10 \rm GeV$). Using a gradient-based framework, we derive CJPL's neutrino floor and estimate the detection prospects for the PandaX-xT experiment. Our results demonstrate that a 500 tonne-year exposure with PandaX-xT could touch the floor, probing spin independent cross-section down to $σ_{n}\sim 3\times 10^{-49} \rm cm^2$ at a DM mass of 70 GeV/$c^2$. |
| title | Characterizing CJPL's Site-Specific Neutrino Floor as the Neutrino Fog Boundary |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2503.22155 |