European Physical Journal C: Particles and Fields (May 2018)

The design of the MEG II experiment

  • A. M. Baldini,
  • E. Baracchini,
  • C. Bemporad,
  • F. Berg,
  • M. Biasotti,
  • G. Boca,
  • P. W. Cattaneo,
  • G. Cavoto,
  • F. Cei,
  • M. Chiappini,
  • G. Chiarello,
  • C. Chiri,
  • G. Cocciolo,
  • A. Corvaglia,
  • A. de Bari,
  • M. De Gerone,
  • A. D’Onofrio,
  • M. Francesconi,
  • Y. Fujii,
  • L. Galli,
  • F. Gatti,
  • F. Grancagnolo,
  • M. Grassi,
  • D. N. Grigoriev,
  • M. Hildebrandt,
  • Z. Hodge,
  • K. Ieki,
  • F. Ignatov,
  • R. Iwai,
  • T. Iwamoto,
  • D. Kaneko,
  • K. Kasami,
  • P.-R. Kettle,
  • B. I. Khazin,
  • N. Khomutov,
  • A. Korenchenko,
  • N. Kravchuk,
  • T. Libeiro,
  • M. Maki,
  • N. Matsuzawa,
  • S. Mihara,
  • M. Milgie,
  • W. Molzon,
  • Toshinori Mori,
  • F. Morsani,
  • A. Mtchedilishvili,
  • M. Nakao,
  • S. Nakaura,
  • D. Nicolò,
  • H. Nishiguchi,
  • M. Nishimura,
  • S. Ogawa,
  • W. Ootani,
  • M. Panareo,
  • A. Papa,
  • A. Pepino,
  • G. Piredda,
  • A. Popov,
  • F. Raffaelli,
  • F. Renga,
  • E. Ripiccini,
  • S. Ritt,
  • M. Rossella,
  • G. Rutar,
  • R. Sawada,
  • G. Signorelli,
  • M. Simonetta,
  • G. F. Tassielli,
  • Y. Uchiyama,
  • M. Usami,
  • M. Venturini,
  • C. Voena,
  • K. Yoshida,
  • Yu. V. Yudin,
  • Y. Zhang

DOI
https://doi.org/10.1140/epjc/s10052-018-5845-6
Journal volume & issue
Vol. 78, no. 5
pp. 1 – 60

Abstract

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Abstract The MEG experiment, designed to search for the $${\mu ^+ \rightarrow \hbox {e}^+ \gamma }$$ μ+→e+γ decay, completed data-taking in 2013 reaching a sensitivity level of $${5.3\times 10^{-13}}$$ 5.3×10-13 for the branching ratio. In order to increase the sensitivity reach of the experiment by an order of magnitude to the level of $$6\times 10^{-14}$$ 6×10-14 , a total upgrade, involving substantial changes to the experiment, has been undertaken, known as MEG II. We present both the motivation for the upgrade and a detailed overview of the design of the experiment and of the expected detector performance.