Belle II 实验的硅顶点探测器
仪器与探测器
2022-09-07 v2
摘要
2019 年，Belle II 实验开始在日本高能加速器研究机构（KEK）运行于 Y(4S) 共振态的非对称 SuperKEKB 对撞机上采集数据。Belle II 将通过收集 50~ab 的积分亮度来寻找超越标准模型的新物理。硅顶点探测器（SVD）由四层双面硅条传感器组成，是两个顶点子探测器之一。SVD 以足够的精度将径迹外推至内部像素探测器（PXD），以正确识别 PXD 中属于该径迹的击中点。此外，SVD 具备独立径迹重建能力，并利用电离作用增强低动量区域的粒子鉴别。尽管暴露于迄今最高峰值亮度对撞机严苛的束流本底中，SVD 仍运行可靠且具有高效率。我们测量了高信噪比和击中效率以及空间分辨率；所有这些量随时间表现出优异的稳定性。近期通过对模拟的仔细调优，簇性质的数据-模拟一致性得到了改善。精确的击中时间分辨率可被用于剔除由束流本底引起的非定时击中，这将使 SVD 在面对更高水平的本底时更加稳健。在运行的前三年中，观测到了辐射损伤对条噪声、传感器电流和耗尽电压的影响，以及由于强烈辐射爆发导致的一些耦合电容失效。这些效应均未导致探测器性能的显著退化。
引用
@article{arxiv.2111.13509,
title = {The Silicon Vertex Detector of the Belle II Experiment},
author = {G. Dujany and K. Adamczyk and L. Aggarwal and H. Aihara and T. Aziz and S. Bacher and S. Bahinipati and G. Batignani and J. Baudot and P. K. Behera and S. Bettarini and T. Bilka and A. Bozek and F. Buchsteiner and G. Casarosa and L. Corona and T. Czank and S. B. Das and C. Finck and F. Forti and M. Friedl and A. Gabrielli and E. Ganiev and B. Gobbo and S. Halder and K. Hara and S. Hazra and T. Higuchi and C. Irmler and A. Ishikawa and H. B. Jeon and Y. Jin and C. Joo and M. Kaleta and A. B. Kaliyar and J. Kandra and K. H. Kang and P. Kapusta and P. Kodyš and T. Kohriki and M. Kumar and R. Kumar and C. La Licata and K. Lalwani and R. Leboucher and S. C. Lee and J. Libby and L. Martel and L. Massaccesi and S. N. Mayekar and G. B. Mohanty and T. Morii and K. R. Nakamura and Z. Natkaniec and Y. Onuki and W. Ostrowicz and A. Paladino and E. Paoloni and H. Park and L. Polat and K. K. Rao and I. Ripp-Baudot and G. Rizzo and D. Sahoo and C. Schwanda and J. Serrano and J. Suzuki and S. Tanaka and H. Tanigawa and R. Thalmeier and R. Tiwari and T. Tsuboyama and Y. Uematsu and O. Verbycka and L. Vitale and K. Wan and Z. Wang and J. Webb and J. Wiechczynski and H. Yin and L. Zani},
journal= {arXiv preprint arXiv:2111.13509},
year = {2022}
}
备注
7 pages, 5 figures, proceedings contribution at the 12th International Conference on Position Sensitive Detectors