Symmetry (Aug 2021)
The Search for μ<sup>+</sup> → e<sup>+</sup>γ with 10<sup>–14</sup> Sensitivity: The Upgrade of the MEG Experiment
- Alessandro M. Baldini,
- 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,
- Yury V. Yudin
Affiliations
- Alessandro M. Baldini
- INFN Sezione di Pisa, Largo B. Pontecorvo 3, 56127 Pisa, Italy
- Vladimir Baranov
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
- Michele Biasotti
- INFN Sezione di Genova, Via Dodecaneso 33, 16146 Genoa, Italy
- Gianluigi Boca
- INFN Sezione di Pavia, Via Bassi 6, 27100 Pavia, Italy
- Paolo W. Cattaneo
- INFN Sezione di Pavia, Via Bassi 6, 27100 Pavia, Italy
- Gianluca Cavoto
- INFN Sezione di Roma, Piazzale A. Moro 2, 00185 Rome, Italy
- Fabrizio Cei
- INFN Sezione di Pisa, Largo B. Pontecorvo 3, 56127 Pisa, Italy
- Marco Chiappini
- INFN Sezione di Pisa, Largo B. Pontecorvo 3, 56127 Pisa, Italy
- Gianluigi Chiarello
- INFN Sezione di Roma, Piazzale A. Moro 2, 00185 Rome, Italy
- Alessandro Corvaglia
- INFN Sezione di Lecce, Via per Arnesano, 73100 Lecce, Italy
- Federica Cuna
- INFN Sezione di Lecce, Via per Arnesano, 73100 Lecce, Italy
- Giovanni dal Maso
- INFN Sezione di Pisa, Largo B. Pontecorvo 3, 56127 Pisa, Italy
- Antonio de Bari
- INFN Sezione di Pavia, Via Bassi 6, 27100 Pavia, Italy
- Matteo De Gerone
- INFN Sezione di Genova, Via Dodecaneso 33, 16146 Genoa, Italy
- Marco Francesconi
- INFN Sezione di Pisa, Largo B. Pontecorvo 3, 56127 Pisa, Italy
- Luca Galli
- INFN Sezione di Pisa, Largo B. Pontecorvo 3, 56127 Pisa, Italy
- Giovanni Gallucci
- INFN Sezione di Genova, Via Dodecaneso 33, 16146 Genoa, Italy
- Flavio Gatti
- INFN Sezione di Genova, Via Dodecaneso 33, 16146 Genoa, Italy
- Francesco Grancagnolo
- INFN Sezione di Lecce, Via per Arnesano, 73100 Lecce, Italy
- Marco Grassi
- INFN Sezione di Pisa, Largo B. Pontecorvo 3, 56127 Pisa, Italy
- Dmitry N. Grigoriev
- Budker Institute of Nuclear Physics of Siberian Branch of Russian Academy of Sciences, 630090 Novosibirsk, Russia
- Malte Hildebrandt
- Paul Scherrer Institut PSI, 5232 Villigen, Switzerland
- Kei Ieki
- ICEPP, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- Fedor Ignatov
- Budker Institute of Nuclear Physics of Siberian Branch of Russian Academy of Sciences, 630090 Novosibirsk, Russia
- Toshiyuki Iwamoto
- ICEPP, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- Peter-Raymond Kettle
- Paul Scherrer Institut PSI, 5232 Villigen, Switzerland
- Nikolay Khomutov
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
- Satoru Kobayashi
- ICEPP, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- Alexander Kolesnikov
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
- Nikolay Kravchuk
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
- Victor Krylov
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
- Nikolay Kuchinskiy
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
- William Kyle
- Department of Physics and Astronomy, University of California, Irvine, CA 92697, USA
- Terence Libeiro
- Department of Physics and Astronomy, University of California, Irvine, CA 92697, USA
- Vladimir Malyshev
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
- Manuel Meucci
- INFN Sezione di Roma, Piazzale A. Moro 2, 00185 Rome, Italy
- Satoshi Mihara
- KEK, High Energy Accelerator Research Organization 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
- William Molzon
- Department of Physics and Astronomy, University of California, Irvine, CA 92697, USA
- Toshinori Mori
- ICEPP, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- Alexander Mtchedlishvili
- Paul Scherrer Institut PSI, 5232 Villigen, Switzerland
- Mitsutaka Nakao
- ICEPP, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- Donato Nicolò
- INFN Sezione di Pisa, Largo B. Pontecorvo 3, 56127 Pisa, Italy
- Hajime Nishiguchi
- KEK, High Energy Accelerator Research Organization 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
- Shinji Ogawa
- ICEPP, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- Rina Onda
- ICEPP, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- Wataru Ootani
- ICEPP, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- Atsushi Oya
- ICEPP, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- Dylan Palo
- Department of Physics and Astronomy, University of California, Irvine, CA 92697, USA
- Marco Panareo
- INFN Sezione di Lecce, Via per Arnesano, 73100 Lecce, Italy
- Angela Papa
- INFN Sezione di Pisa, Largo B. Pontecorvo 3, 56127 Pisa, Italy
- Valerio Pettinacci
- INFN Sezione di Roma, Piazzale A. Moro 2, 00185 Rome, Italy
- Alexander Popov
- Budker Institute of Nuclear Physics of Siberian Branch of Russian Academy of Sciences, 630090 Novosibirsk, Russia
- Francesco Renga
- INFN Sezione di Roma, Piazzale A. Moro 2, 00185 Rome, Italy
- Stefan Ritt
- Paul Scherrer Institut PSI, 5232 Villigen, Switzerland
- Massimo Rossella
- INFN Sezione di Pavia, Via Bassi 6, 27100 Pavia, Italy
- Aleksander Rozhdestvensky
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
- Patrick Schwendimann
- Paul Scherrer Institut PSI, 5232 Villigen, Switzerland
- Kohei Shimada
- ICEPP, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- Giovanni Signorelli
- INFN Sezione di Pisa, Largo B. Pontecorvo 3, 56127 Pisa, Italy
- Alexey Stoykov
- Paul Scherrer Institut PSI, 5232 Villigen, Switzerland
- Giovanni F. Tassielli
- INFN Sezione di Lecce, Via per Arnesano, 73100 Lecce, Italy
- Kazuki Toyoda
- ICEPP, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- Yusuke Uchiyama
- ICEPP, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- Masashi Usami
- ICEPP, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- Cecilia Voena
- INFN Sezione di Roma, Piazzale A. Moro 2, 00185 Rome, Italy
- Kosuke Yanai
- ICEPP, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- Kensuke Yamamoto
- ICEPP, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- Taku Yonemoto
- ICEPP, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- Yury V. Yudin
- Budker Institute of Nuclear Physics of Siberian Branch of Russian Academy of Sciences, 630090 Novosibirsk, Russia
- DOI
- https://doi.org/10.3390/sym13091591
- Journal volume & issue
-
Vol. 13,
no. 9
p. 1591
Abstract
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.
Keywords
- lepton flavor violation
- rare muon decay
- high intensity experiment
- particle detector
- physics beyond the Standard Model
