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The Search for $\mu^+\to e^+ \gamma$ with 10$^{-14}$ Sensitivity: the Upgrade of the MEG Experiment

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arxiv 2107.10767 v2 pith:IVZHSF7N submitted 2021-07-22 hep-ex physics.ins-det

The MEG II Collaboration: Alessandro M. Baldini , Vladimir Baranov , Michele Biasotti , Gianluigi Boca , Paolo W. Cattaneo , Gianluca Cavoto , Fabrizio Cei , Marco Chiappini
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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
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classification hep-exphysics.ins-det
keywords detectorgammasensitivityexperimentflavourinstituteleptonpaul
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abstract

The MEG experiment took data at the Paul Scherrer Institute in the years 2009--2013 to test the violation of the lepton flavour 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 flavour violating decay ${\mu}^+ \rightarrow {\rm e}^+ \gamma$: BR(${\mu}^+ \rightarrow {\rm e}^+ \gamma$) $<4.2 \times 10^{-13}$ at 90% confidence level. The MEG detector has been upgraded in order to reach a sensitivity of $6\times10^{-14}$. The basic principle of MEG II is to achieve the highest possible sensitivity using the full muon beam intensity at the Paul Scherrer Institute ($7\times10^{7}$ 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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Cited by 2 Pith papers

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  1. The Advanced Muon Facility: a proposed multi-purpose muon facility at Fermilab

    hep-ex 2025-01 conditional novelty 4.0 of 10

    The paper proposes the Advanced Muon Facility, a Fermilab storage ring complex designed to search for charged lepton flavor violation in all three muon-to-electron channels at sensitivities orders of magnitude beyond ...

  2. Experimental Measurements of the Muon $g-2$ and Searches for Charged Lepton Flavor Violation in the Muon Sector

    hep-ex 2025-01 unverdicted

    A proceedings review summarizing the Fermilab muon g-2 measurements and the MEG-II, Mu3e, COMET, and Mu2e charged lepton flavor violation searches, with no new results or analyses.

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