Realistic Detector Geometry Modeling and Its Impact on Event Reconstruction in JUNO
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arXiv
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| Autores principales: | , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| Materias: | |
| Acceso en línea: | |
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| _version_ | 1866913034872553472 |
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| author | Wu, Zhaoxiang He, Miao Luo, Wuming Deng, Ziyan He, Wei Heng, Yuekun Jing, Xiaoping Li, Bo Ma, Xiaoyan Qian, Xiaohui Qin, Zhonghua Wang, Yifang Yu, Peidong |
| author_facet | Wu, Zhaoxiang He, Miao Luo, Wuming Deng, Ziyan He, Wei Heng, Yuekun Jing, Xiaoping Li, Bo Ma, Xiaoyan Qian, Xiaohui Qin, Zhonghua Wang, Yifang Yu, Peidong |
| contents | JUNO is designed to determine the neutrino mass ordering with an energy resolution of 3% at 1 MeV. In the real detector, however, deformations of the central stainless-steel structure during installation lead to deviations of the photomultiplier tube (PMT) positions from their design values. Based on the limited survey data of the PMTs and the stainless-steel truss, we perform a correlation analysis of the measured points and propose a method to predict the positions of all PMTs. Using the resulting realistic geometry, we demonstrate that the detector deformation has a negligible effect on the energy reconstruction. In contrast, inaccuracies in the assumed geometry can introduce vertex biases of up to 40 mm. Incorporating the realistic geometry into the calibration-based PMT response model removes this bias and preserves the stability of the reconstruction algorithms. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_13747 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Realistic Detector Geometry Modeling and Its Impact on Event Reconstruction in JUNO Wu, Zhaoxiang He, Miao Luo, Wuming Deng, Ziyan He, Wei Heng, Yuekun Jing, Xiaoping Li, Bo Ma, Xiaoyan Qian, Xiaohui Qin, Zhonghua Wang, Yifang Yu, Peidong Instrumentation and Detectors High Energy Physics - Experiment JUNO is designed to determine the neutrino mass ordering with an energy resolution of 3% at 1 MeV. In the real detector, however, deformations of the central stainless-steel structure during installation lead to deviations of the photomultiplier tube (PMT) positions from their design values. Based on the limited survey data of the PMTs and the stainless-steel truss, we perform a correlation analysis of the measured points and propose a method to predict the positions of all PMTs. Using the resulting realistic geometry, we demonstrate that the detector deformation has a negligible effect on the energy reconstruction. In contrast, inaccuracies in the assumed geometry can introduce vertex biases of up to 40 mm. Incorporating the realistic geometry into the calibration-based PMT response model removes this bias and preserves the stability of the reconstruction algorithms. |
| title | Realistic Detector Geometry Modeling and Its Impact on Event Reconstruction in JUNO |
| topic | Instrumentation and Detectors High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2604.13747 |