Joint analysis of reactor and accelerator CE$ν$NS data on germanium: implications for the Standard Model and nuclear physics
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866916984140070912 |
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| author | Corona, M. Atzori Cadeddu, M. Cargioli, N. Co', G. Dordei, F. Giunti, C. |
| author_facet | Corona, M. Atzori Cadeddu, M. Cargioli, N. Co', G. Dordei, F. Giunti, C. |
| contents | This work presents the first comprehensive joint analysis of all available Coherent Elastic Neutrino-Nucleus Scattering (CE$ν$NS) data on germanium: those observed at the Spallation Neutron Source (SNS) by the COHERENT collaboration and those of the nuclear reactors revealed by the CONUS+ experiment using germanium detectors. In addition to COHERENT and CONUS+, we incorporate reactor data from TEXONO and $ν$GeN, thereby enhancing both the statistical significance and the systematic reliability of our study. We provide state-of-the-art determinations of key nuclear physics and Standard Model parameters, including the neutron root-mean-square (rms) radius of germanium nuclei, the weak mixing angle, and the neutrino charge radius. The observed tension of about $2 σ$ between the COHERENT germanium measurement and the Standard Model prediction motivates a detailed reassessment of the theoretical cross-section. In particular, we examine the impact of nuclear form factors and uncertainties in the nuclear radius, as well as the potential influence of a systematic shift in the neutrino flux normalisation at the SNS. Our results highlight the reliability of CE$ν$NS as a precision tool, reinforced by the complementarity of different experimental inputs, and lay the groundwork for future advances in the field. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2506_13555 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Joint analysis of reactor and accelerator CE$ν$NS data on germanium: implications for the Standard Model and nuclear physics Corona, M. Atzori Cadeddu, M. Cargioli, N. Co', G. Dordei, F. Giunti, C. High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Theory This work presents the first comprehensive joint analysis of all available Coherent Elastic Neutrino-Nucleus Scattering (CE$ν$NS) data on germanium: those observed at the Spallation Neutron Source (SNS) by the COHERENT collaboration and those of the nuclear reactors revealed by the CONUS+ experiment using germanium detectors. In addition to COHERENT and CONUS+, we incorporate reactor data from TEXONO and $ν$GeN, thereby enhancing both the statistical significance and the systematic reliability of our study. We provide state-of-the-art determinations of key nuclear physics and Standard Model parameters, including the neutron root-mean-square (rms) radius of germanium nuclei, the weak mixing angle, and the neutrino charge radius. The observed tension of about $2 σ$ between the COHERENT germanium measurement and the Standard Model prediction motivates a detailed reassessment of the theoretical cross-section. In particular, we examine the impact of nuclear form factors and uncertainties in the nuclear radius, as well as the potential influence of a systematic shift in the neutrino flux normalisation at the SNS. Our results highlight the reliability of CE$ν$NS as a precision tool, reinforced by the complementarity of different experimental inputs, and lay the groundwork for future advances in the field. |
| title | Joint analysis of reactor and accelerator CE$ν$NS data on germanium: implications for the Standard Model and nuclear physics |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Theory |
| url | https://arxiv.org/abs/2506.13555 |