The Search for μ+ → e+γ with 10–14 Sensitivity: The Upgrade of the MEG Experiment

Baldini, Alessandro; Baranov, Vladimir; Biasotti, Michele; Boca, Gianluigi; Cattaneo, Paolo; Cavoto, Gianluca; Cei, Fabrizio; Chiappini, Marco; Chiarello, Gianluigi; Corvaglia, Alessandro; Cuna, Federica; dal Maso, Giovanni; de Bari, Antonio; De Gerone, Matteo; Francesconi, Marco; Galli, Luca; Gallucci, Giovanni; Gatti, Flavio; Grancagnolo, Francesco; Grassi, Marco; Grigoriev, Dmitry; Hildebrandt, Malte; Ieki, Kei; Ignatov, Fedor; Iwamoto, Toshiyuki; Kettle, Peter-Raymond; Khomutov, Nikolay; Kobayashi, Satoru; Kolesnikov, Alexander; Kravchuk, Nikolay; Krylov, Victor; Kuchinskiy, Nikolay; Kyle, William; Libeiro, Terence; Malyshev, Vladimir; Meucci, Manuel; Mihara, Satoshi; Molzon, William; Mori, Toshinori; Mtchedlishvili, Alexander; Nakao, Mitsutaka; Nicolò, Donato; Nishiguchi, Hajime; Ogawa, Shinji; Onda, Rina; Ootani, Wataru; Oya, Atsushi; Palo, Dylan; Panareo, Marco; Papa, Angela; Pettinacci, Valerio; Popov, Alexander; Renga, Francesco; Ritt, Stefan; Rossella, Massimo; Rozhdestvensky, Aleksander; Schwendimann, Patrick; Shimada, Kohei; Signorelli, Giovanni; Stoykov, Alexey; Tassielli, Giovanni; Toyoda, Kazuki; Uchiyama, Yusuke; Usami, Masashi; Voena, Cecilia; Yanai, Kosuke; Yamamoto, Kensuke; Yonemoto, Taku; Yudin, Yury

doi:10.3390/sym13091591

Title: The Search for μ+ → e+γ with 10–14 Sensitivity: The Upgrade of the MEG Experiment

Journal Article · 28 August 2021 · Symmetry

DOI: https://doi.org/10.3390/sym13091591 · OSTI ID:1818162

; Baranov, Vladimir; Biasotti, Michele;

;

The MEG experiment took data at the Paul Scherrer Institute in the years 2009–2013 to test the violation of the lepton flavor conservation law, which originates from an accidental symmetry that the Standard Model of elementary particle physics has, and published the most stringent limit on the charged lepton flavor violating decay μ+→e+γ: BR(μ+→e+γ) <4.2×10−13 at 90% confidence level. The MEG detector has been upgraded in order to reach a sensitivity of 6×10−14. The basic principle of MEG II is to achieve the highest possible sensitivity using the full muon beam intensity at the Paul Scherrer Institute (7×107 muons/s) with an upgraded detector. The main improvements are better rate capability of all sub-detectors and improved resolutions while keeping the same detector concept. In this paper, we present the current status of the preparation, integration and commissioning of the MEG II detector in the recent engineering runs.

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Research Organization:: Univ. of California, Irvine, CA (United States)

Sponsoring Organization:: JSPS KAKENHI; Swiss National Science Foundation (SNF); USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: FG02-91ER40679

OSTI ID:: 1818162

Journal Information:: Symmetry, Journal Name: Symmetry Journal Issue: 9 Vol. 13; ISSN SYMMAM; ISSN 2073-8994

Publisher:: MDPI AGCopyright Statement

Country of Publication:: Switzerland

Language:: English

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