https://doi.org/10.1140/epjc/s10052-018-5845-6
Special Article – Tools for Experiment and Theory
The design of the MEG II experiment
MEG II Collaboration
1
INFN Sezione di Pisa; Dipartimento di Fisica, dell’Università, Largo B. Pontecorvo 3, 56127 Pisa; Scuola Normale Superiore, Piazza dei Cavalieri, 56127, Pisa, Italy
2
ICEPP, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
3
Paul Scherrer Institut PSI, 5232, Villigen, Switzerland
4
Swiss Federal Institute of Technology ETH, 8093, Zurich, Switzerland
5
INFN Sezione di Genova; Dipartimento di Fisica, dell’Università, Via Dodecaneso 33, 16146, Genoa, Italy
6
INFN Sezione di Pavia; Dipartimento di Fisica, dell’Università, Via Bassi 6, 27100, Pavia, Italy
7
INFN Sezione di Roma; Dipartimento di Fisica, dell’Università “Sapienza”, Piazzale A. Moro, 00185, Rome, Italy
8
Dipartimento di Scienze Fisiche, della Terra e dell’Ambiente dell’Università, Via Roma 56, 53100, Siena, Italy
9
INFN Sezione di Lecce; Dipartimento di Matematica e Fisica, dell’Università del Salento, Via per Arnesano, 73100, Lecce, Italy
10
Budker Institute of Nuclear Physics of Siberian Branch of Russian Academy of Sciences, 630090, Novosibirsk, Russia
11
Novosibirsk State Technical University, 630092, Novosibirsk, Russia
12
Novosibirsk State University, 630090, Novosibirsk, Russia
13
KEK, High Energy Accelerator Research Organization 1-1 Oho, Tsukuba, Ibaraki, 305-0801, Japan
14
Joint Institute for Nuclear Research, 141980, Dubna, Russia
15
University of California, Irvine, CA, 92697, USA
* e-mail: paolo.cattaneo@pv.infn.it
Received:
16
January
2018
Accepted:
26
April
2018
Published online:
16
May
2018
The MEG experiment, designed to search for the 
decay, completed data-taking in 2013 reaching a sensitivity level of 
for the branching ratio. In order to increase the sensitivity reach of the experiment by an order of magnitude to the level of 
, 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.
© The Author(s), 2018
