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Article

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

1
INFN Sezione di Pisa, Largo B. Pontecorvo 3, 56127 Pisa, Italy
2
Joint Institute for Nuclear Research, 141980 Dubna, Russia
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INFN Sezione di Genova, Via Dodecaneso 33, 16146 Genoa, Italy
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Dipartimento di Fisica, dell’Università di Genova, Via Dodecaneso 33, 16146 Genoa, Italy
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INFN Sezione di Pavia, Via Bassi 6, 27100 Pavia, Italy
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Dipartimento di Fisica, dell’Università di Pavia, Via Bassi 6, 27100 Pavia, Italy
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INFN Sezione di Roma, Piazzale A. Moro 2, 00185 Rome, Italy
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Dipartimento di Fisica, dell’Università “Sapienza” di Roma, Piazzale A. Moro 2, 00185 Rome, Italy
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Dipartimento di Fisica, dell’Università di Pisa, Largo B. Pontecorvo 3, 56127 Pisa, Italy
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INFN Sezione di Lecce, Via per Arnesano, 73100 Lecce, Italy
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Dipartimento di Matematica e Fisica, dell’Università del Salento, Via per Arnesano, 73100 Lecce, Italy
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Paul Scherrer Institut PSI, 5232 Villigen, Switzerland
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Budker Institute of Nuclear Physics of Siberian Branch of Russian Academy of Sciences, 630090 Novosibirsk, Russia
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Physico-Technical Department, Novosibirsk State Technical University, 630092 Novosibirsk, Russia
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ICEPP, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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Department of Physics and Astronomy, University of California, Irvine, CA 92697, USA
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KEK, High Energy Accelerator Research Organization 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
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Department of Physics, Swiss Federal Institute of Technology ETH, 8093 Zurich, Switzerland
*
Authors to whom correspondence should be addressed.
Academic Editor: Jorge Segovia
Symmetry 2021, 13(9), 1591; https://doi.org/10.3390/sym13091591
Received: 23 July 2021 / Revised: 15 August 2021 / Accepted: 17 August 2021 / Published: 29 August 2021
(This article belongs to the Special Issue Upgrades in High Energy Physics Experiments)
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) <4.2×1013 at 90% confidence level. The MEG detector has been upgraded in order to reach a sensitivity of 6×1014. 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. View Full-Text
Keywords: lepton flavor violation; rare muon decay; high intensity experiment; particle detector; physics beyond the Standard Model lepton flavor violation; rare muon decay; high intensity experiment; particle detector; physics beyond the Standard Model
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MDPI and ACS Style

Baldini, A.M.; Baranov, V.; Biasotti, M.; Boca, G.; Cattaneo, P.W.; Cavoto, G.; Cei, F.; Chiappini, M.; Chiarello, G.; Corvaglia, A.; Cuna, F.; dal Maso, G.; de Bari, A.; De Gerone, M.; Francesconi, M.; Galli, L.; Gallucci, G.; Gatti, F.; Grancagnolo, F.; Grassi, M.; Grigoriev, D.N.; Hildebrandt, M.; Ieki, K.; Ignatov, F.; Iwamoto, T.; Kettle, P.-R.; Khomutov, N.; Kobayashi, S.; Kolesnikov, A.; Kravchuk, N.; Krylov, V.; Kuchinskiy, N.; Kyle, W.; Libeiro, T.; Malyshev, V.; Meucci, M.; Mihara, S.; Molzon, W.; Mori, T.; Mtchedlishvili, A.; Nakao, M.; Nicolò, D.; Nishiguchi, H.; Ogawa, S.; Onda, R.; Ootani, W.; Oya, A.; Palo, D.; Panareo, M.; Papa, A.; Pettinacci, V.; Popov, A.; Renga, F.; Ritt, S.; Rossella, M.; Rozhdestvensky, A.; Schwendimann, P.; Shimada, K.; Signorelli, G.; Stoykov, A.; Tassielli, G.F.; Toyoda, K.; Uchiyama, Y.; Usami, M.; Voena, C.; Yanai, K.; Yamamoto, K.; Yonemoto, T.; Yudin, Y.V. The Search for μ+ → e+γ with 10–14 Sensitivity: The Upgrade of the MEG Experiment. Symmetry 2021, 13, 1591. https://doi.org/10.3390/sym13091591

AMA Style

Baldini AM, Baranov V, Biasotti M, Boca G, Cattaneo PW, Cavoto G, Cei F, Chiappini M, Chiarello G, Corvaglia A, Cuna F, dal Maso G, de Bari A, De Gerone M, Francesconi M, Galli L, Gallucci G, Gatti F, Grancagnolo F, Grassi M, Grigoriev DN, Hildebrandt M, Ieki K, Ignatov F, Iwamoto T, Kettle P-R, Khomutov N, Kobayashi S, Kolesnikov A, Kravchuk N, Krylov V, Kuchinskiy N, Kyle W, Libeiro T, Malyshev V, Meucci M, Mihara S, Molzon W, Mori T, Mtchedlishvili A, Nakao M, Nicolò D, Nishiguchi H, Ogawa S, Onda R, Ootani W, Oya A, Palo D, Panareo M, Papa A, Pettinacci V, Popov A, Renga F, Ritt S, Rossella M, Rozhdestvensky A, Schwendimann P, Shimada K, Signorelli G, Stoykov A, Tassielli GF, Toyoda K, Uchiyama Y, Usami M, Voena C, Yanai K, Yamamoto K, Yonemoto T, Yudin YV. The Search for μ+ → e+γ with 10–14 Sensitivity: The Upgrade of the MEG Experiment. Symmetry. 2021; 13(9):1591. https://doi.org/10.3390/sym13091591

Chicago/Turabian Style

Baldini, Alessandro M., Vladimir Baranov, Michele Biasotti, Gianluigi Boca, Paolo W. Cattaneo, Gianluca Cavoto, Fabrizio Cei, Marco Chiappini, Gianluigi Chiarello, Alessandro Corvaglia, Federica Cuna, Giovanni dal Maso, Antonio de Bari, Matteo De Gerone, Marco Francesconi, Luca Galli, Giovanni Gallucci, Flavio Gatti, Francesco Grancagnolo, Marco Grassi, Dmitry N. Grigoriev, Malte Hildebrandt, Kei Ieki, Fedor Ignatov, Toshiyuki Iwamoto, Peter-Raymond Kettle, Nikolay Khomutov, Satoru Kobayashi, Alexander Kolesnikov, Nikolay Kravchuk, Victor Krylov, Nikolay Kuchinskiy, William Kyle, Terence Libeiro, Vladimir Malyshev, Manuel Meucci, Satoshi Mihara, William Molzon, Toshinori Mori, Alexander Mtchedlishvili, Mitsutaka Nakao, Donato Nicolò, Hajime Nishiguchi, Shinji Ogawa, Rina Onda, Wataru Ootani, Atsushi Oya, Dylan Palo, Marco Panareo, Angela Papa, Valerio Pettinacci, Alexander Popov, Francesco Renga, Stefan Ritt, Massimo Rossella, Aleksander Rozhdestvensky, Patrick Schwendimann, Kohei Shimada, Giovanni Signorelli, Alexey Stoykov, Giovanni F. Tassielli, Kazuki Toyoda, Yusuke Uchiyama, Masashi Usami, Cecilia Voena, Kosuke Yanai, Kensuke Yamamoto, Taku Yonemoto, and Yury V. Yudin. 2021. "The Search for μ+ → e+γ with 10–14 Sensitivity: The Upgrade of the MEG Experiment" Symmetry 13, no. 9: 1591. https://doi.org/10.3390/sym13091591

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