The Search for μ+ → e+γ with 10–14 Sensitivity: The Upgrade of the MEG Experiment
Author:
Baldini Alessandro M.ORCID, Baranov Vladimir, Biasotti Michele, Boca GianluigiORCID, Cattaneo Paolo W.ORCID, Cavoto GianlucaORCID, Cei FabrizioORCID, Chiappini MarcoORCID, Chiarello GianluigiORCID, Corvaglia AlessandroORCID, Cuna FedericaORCID, dal Maso GiovanniORCID, de Bari AntonioORCID, De Gerone MatteoORCID, Francesconi MarcoORCID, Galli LucaORCID, Gallucci GiovanniORCID, Gatti FlavioORCID, Grancagnolo FrancescoORCID, Grassi MarcoORCID, Grigoriev Dmitry N., Hildebrandt MalteORCID, Ieki Kei, Ignatov Fedor, Iwamoto ToshiyukiORCID, Kettle Peter-Raymond, Khomutov Nikolay, Kobayashi SatoruORCID, Kolesnikov Alexander, Kravchuk Nikolay, Krylov Victor, Kuchinskiy Nikolay, Kyle WilliamORCID, Libeiro Terence, Malyshev Vladimir, Meucci ManuelORCID, Mihara SatoshiORCID, Molzon WilliamORCID, Mori ToshinoriORCID, Mtchedlishvili Alexander, Nakao Mitsutaka, Nicolò DonatoORCID, Nishiguchi HajimeORCID, Ogawa Shinji, Onda RinaORCID, Ootani WataruORCID, Oya Atsushi, Palo DylanORCID, Panareo MarcoORCID, Papa AngelaORCID, Pettinacci ValerioORCID, Popov Alexander, Renga FrancescoORCID, Ritt StefanORCID, Rossella MassimoORCID, Rozhdestvensky Aleksander, Schwendimann Patrick, Shimada Kohei, Signorelli GiovanniORCID, Stoykov AlexeyORCID, Tassielli Giovanni F.ORCID, Toyoda Kazuki, Uchiyama YusukeORCID, Usami Masashi, Voena CeciliaORCID, Yanai Kosuke, Yamamoto Kensuke, Yonemoto Taku, Yudin Yury V.
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.
Funder
U.S. Department of Energy Ministero dell’Istruzione, dell’Università e della Ricerca Japan Society for the Promotion of Science Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
Subject
Physics and Astronomy (miscellaneous),General Mathematics,Chemistry (miscellaneous),Computer Science (miscellaneous)
Cited by
18 articles.
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