{"title":"利用 MEG II 液氙热量计进行光子能量重建","authors":"Kensuke Yamamoto, Sei Ban, Lukas Gerritzen, Toshiyuki Iwamoto, Satoru Kobayashi, Ayaka Matsushita, Toshinori Mori, Rina Onda, Wataru Ootani, Atsushi Oya","doi":"arxiv-2407.19417","DOIUrl":null,"url":null,"abstract":"The MEG II experiment searches for a charged-lepton-flavour-violating $\\mu\n\\to e \\gamma$ with the target sensitivity of $6 \\times 10^{-14}$. A liquid\nxenon calorimeter with VUV-sensitive photosensors measures photon position,\ntiming, and energy. This paper concentrates on the precise photon energy\nreconstruction with the MEG II liquid xenon calorimeter. Since a muon beam rate\nis $3\\text{-}5 \\times 10^{7}~\\text{s}^{-1}$, multi-photon elimination analysis\nis performed using waveform analysis techniques such as a template waveform\nfit. As a result, background events in the energy range of 48-58 MeV were\nreduced by 34 %. The calibration of an energy scale of the calorimeter with\nseveral calibration sources is also discussed to achieve a high resolution of\n1.8 %.","PeriodicalId":501374,"journal":{"name":"arXiv - PHYS - Instrumentation and Detectors","volume":"56 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Photon energy reconstruction with the MEG II liquid xenon calorimeter\",\"authors\":\"Kensuke Yamamoto, Sei Ban, Lukas Gerritzen, Toshiyuki Iwamoto, Satoru Kobayashi, Ayaka Matsushita, Toshinori Mori, Rina Onda, Wataru Ootani, Atsushi Oya\",\"doi\":\"arxiv-2407.19417\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The MEG II experiment searches for a charged-lepton-flavour-violating $\\\\mu\\n\\\\to e \\\\gamma$ with the target sensitivity of $6 \\\\times 10^{-14}$. A liquid\\nxenon calorimeter with VUV-sensitive photosensors measures photon position,\\ntiming, and energy. This paper concentrates on the precise photon energy\\nreconstruction with the MEG II liquid xenon calorimeter. Since a muon beam rate\\nis $3\\\\text{-}5 \\\\times 10^{7}~\\\\text{s}^{-1}$, multi-photon elimination analysis\\nis performed using waveform analysis techniques such as a template waveform\\nfit. As a result, background events in the energy range of 48-58 MeV were\\nreduced by 34 %. The calibration of an energy scale of the calorimeter with\\nseveral calibration sources is also discussed to achieve a high resolution of\\n1.8 %.\",\"PeriodicalId\":501374,\"journal\":{\"name\":\"arXiv - PHYS - Instrumentation and Detectors\",\"volume\":\"56 1\",\"pages\":\"\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2024-07-28\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"arXiv - PHYS - Instrumentation and Detectors\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/arxiv-2407.19417\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"arXiv - PHYS - Instrumentation and Detectors","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/arxiv-2407.19417","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
摘要
MEG II实验以6美元乘以10^{-14}美元的目标灵敏度搜索带电轻子--对伽马射线的破坏。带有紫外光敏感光敏传感器的液氙量热器测量光子的位置、时间和能量。本文主要介绍利用MEG II液态氙量热器进行的精确光子能量重建。由于μ介子束速率是10^{7}~text{s}^{-1}$的3/text{-}5倍，因此使用模板波形拟合等波形分析技术进行多光子消除分析。结果，48-58 MeV 能量范围内的背景事件减少了 34%。此外，还讨论了用多个校准源校准量热计能量标的问题，以实现 1.8 % 的高分辨率。
Photon energy reconstruction with the MEG II liquid xenon calorimeter
The MEG II experiment searches for a charged-lepton-flavour-violating $\mu
\to e \gamma$ with the target sensitivity of $6 \times 10^{-14}$. A liquid
xenon calorimeter with VUV-sensitive photosensors measures photon position,
timing, and energy. This paper concentrates on the precise photon energy
reconstruction with the MEG II liquid xenon calorimeter. Since a muon beam rate
is $3\text{-}5 \times 10^{7}~\text{s}^{-1}$, multi-photon elimination analysis
is performed using waveform analysis techniques such as a template waveform
fit. As a result, background events in the energy range of 48-58 MeV were
reduced by 34 %. The calibration of an energy scale of the calorimeter with
several calibration sources is also discussed to achieve a high resolution of
1.8 %.
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