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Nishiguchi, K. Ieki, K. Toyoda, K. Yanai, L. Galli, M. Biasotti, M. Chiappini, M. De Gerone, M. Francesconi, M. Grassi, M. Hildebrandt, M. Meucci, M. Nakao, M. Nishimura, M. Panareo, M. Rossella, M. Usami, N. Khomutov, N. Kravchuk, N. Kuchinskiy, N. Matsuzawa, P.-R. Kettle, P. Schwendimann, P. W. Cattaneo, R. Iwai, R. Onda, R. Sawada, S. Kobayashi, S. Mihara, S. Ogawa, S. Ritt, T. Iwamoto, T. Libeiro, Toshinori Mori, V. Malyshev, V. Pettinacci, W. Kyle, W. Molzon, W. Ootani, Y. Uchiyama, Yu.V. Yudin, Z. Hodge","submitted_at":"2020-05-01T12:29:41Z","abstract_excerpt":"We present the first direct search for lepton flavour violating muon decay mediated by a new light particle X, $\\mu^+ \\to \\mathrm{e}^+\\mathrm{X}, \\mathrm{X} \\to \\gamma\\gamma$. This search uses a dataset resulting from $7.5\\times 10^{14}$ stopped muons collected by the MEG experiment at the Paul Scherrer Institut in the period 2009--2013. 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