在大型液氙探测器中推进脉冲形状鉴别的极限
仪器与探测器
2026-03-31 v1 高能物理 - 实验
摘要
LUX-ZEPLIN（LZ）实验是一个暗物质直接探测实验，通过WIMP-核子相互作用优化搜索弱相互作用大质量粒子（WIMPs）。暗物质探测的主要挑战是区分WIMP信号和本底事件。在LZ中，电离与闪烁信号之比（电荷-光比）是排斥电子反冲（ER）本底的主要方法。脉冲形状鉴别（PSD）为液氙探测器中额外的ER本底排斥提供了一种方法。在本文中，讨论了LZ实验中PSD的鉴别能力。为了精确表征闪烁脉冲形状，开发了一个分析框架来重建单个光子的探测时间。利用LZ校准数据，光子定时前段鉴别器得到优化，实现了低至15%的ER泄漏。对于¹²⁴Xe双电子捕获等特定本底过程，泄漏进一步降低至约5%。PSD与电荷-光比结合形成双因子鉴别（TFD）。优化后的TFD性能与电荷-光比方法的性能进行了比较，对于大闪烁脉冲，相应的误报率降低了最多两倍。最后，PSD和TFD被应用于LZ的WS2024运行数据，并总结了其性能。
引用
@article{arxiv.2603.26877,
title = {Pushing the Limits of Pulse Shape Discrimination in a Large Liquid Xenon Detector},
author = {D. S. Akerib and A. K. Al Musalhi and F. Alder and B. J. Almquist and C. S. Amarasinghe and A. Ames and T. J. Anderson and N. Angelides and H. M. Araújo and J. E. Armstrong and M. Arthurs and A. Baker and S. Balashov and J. Bang and J. W. Bargemann and E. E. Barillier and K. Beattie and A. Bhatti and T. P. Biesiadzinski and H. J. Birch and E. Bishop and G. M. Blockinger and C. A. J. Brew and P. Brás and S. Burdin and M. C. Carmona-Benitez and M. Carter and A. Chawla and H. Chen and Y. T. Chin and N. I. Chott and S. Contreras and M. V. Converse and R. Coronel and A. Cottle and G. Cox and D. Curran and C. E. Dahl and I. Darlington and S. Dave and A. David and J. Delgaudio and S. Dey and L. de Viveiros and L. Di Felice and C. Ding and J. E. Y. Dobson and E. Druszkiewicz and S. Dubey and C. L. Dunbar and S. R. Eriksen and N. M. Fearon and N. Fieldhouse and S. Fiorucci and H. Flaecher and E. D. Fraser and T. M. A. Fruth and P. W. Gaemers and R. J. Gaitskell and A. Geffre and J. Genovesi and C. Ghag and J. Ghamsari and A. Ghosh and S. Ghosh and R. Gibbons and S. Gokhale and J. Green and M. G. D. van der Grinten and J. J. Haiston and C. R. Hall and T. Hall and R. H. Hampp and S. J. Haselschwardt and M. A. Hernandez and S. A. Hertel and G. J. Homenides and M. Horn and D. Q. Huang and D. Hunt and E. Jacquet and R. S. James and K. Jenkins and A. C. Kaboth and A. C. Kamaha and M. K. Kannichankandy and D. Khaitan and A. Khazov and J. Kim and Y. D. Kim and D. Kodroff and E. V. Korolkova and H. Kraus and S. Kravitz and L. Kreczko and V. A. Kudryavtsev and C. Lawes and E. B. Leon and D. S. Leonard and K. T. Lesko and C. Levy and J. Lin and A. Lindote and W. H. Lippincott and J. Long and M. I. Lopes and W. Lorenzon and C. Lu and S. Luitz and W. Ma and V. Mahajan and P. A. Majewski and A. Manalaysay and R. L. Mannino and R. J. Matheson and C. Maupin and M. E. McCarthy and D. N. McKinsey and J. McLaughlin and J. B. McLaughlin and R. McMonigle and B. Mitra and E. Mizrachi and M. E. Monzani and K. Morå and E. Morrison and B. J. Mount and M. Murdy and A. St. J. Murphy and H. N. Nelson and F. Neves and A. Nguyen and C. L. O'Brien and F. H. O'Shea and I. Olcina and K. C. Oliver-Mallory and J. Orpwood and K. Y. Oyulmaz and K. J. Palladino and N. J. Pannifer and S. J. Patton and B. Penning and G. Pereira and E. Perry and T. Pershing and A. Piepke and S. S. Poudel and Y. Qie and J. Reichenbacher and C. A. Rhyne and G. R. C. Rischbieter and E. Ritchey and H. S. Riyat and R. Rosero and N. J. Rowe and T. Rushton and D. Rynders and S. Saltão and D. Santone and A. B. M. R. Sazzad and R. W. Schnee and G. Sehr and B. Shafer and S. Shaw and W. Sherman and K. Shi and T. Shutt and C. Silva and G. Sinev and J. Siniscalco and A. M. Slivar and A. M. Softley-Brown and V. N. Solovov and P. Sorensen and J. Soria and T. J. Sumner and A. Swain and M. Szydagis and D. R. Tiedt and D. R. Tovey and J. Tranter and M. Trask and K. Trengove and M. Tripathi and A. Usón and A. C. Vaitkus and O. Valentino and V. Velan and A. Wang and J. J. Wang and Y. Wang and L. Weeldreyer and T. J. Whitis and K. Wild and M. Williams and J. Winnicki and L. Wolf and F. L. H. Wolfs and S. Woodford and D. Woodward and C. J. Wright and Q. Xia and J. Xu and Y. Xu and M. Yeh and D. Yeum and J. Young and W. Zha and H. Zhang and T. Zhang and Y. Zhou},
journal= {arXiv preprint arXiv:2603.26877},
year = {2026}
}
备注
16 pages, 14 figures