Search for lepton flavour violating muon decay mediated by a new light particle in the MEG experiment
- Baldini, A. M.
- Berg, F.
- Biasotti, M.
- Boca, G.
- Cattaneo, P. W.
- Cavoto, G.
- Cei, F.
- Chiappini, M.
- Chiarello, G.
- Chiri, C.
- Corvaglia, A.
- de Bari, A.
- De Gerone, M.
- Francesconi, M.
- Galli, L.
- Gatti, F.
- Grancagnolo, F.
- Grassi, M.
- Grigoriev, D. N.
- Hildebrandt, M.
- Hodge, Z.
- Ieki, K.
- Ignatov, F.
- Iwai, R.
- Iwamoto, T.
- Kobayashi, S.
- Kettle, P. -R.
- Kyle, W.
- Khomutov, N.
- Kolesnikov, A.
- Kravchuk, N.
- Kuchinskiy, N.
- Libeiro, T.
- Lim, G. M. A.
- Malyshev, V.
- Matsuzawa, N.
- Meucci, M.
- Mihara, S.
- Molzon, W.
- Mori, Toshinori
- Mtchedilishvili, A.
- Nakao, M.
- Natori, H.
- Nicolò, D.
- Nishiguchi, H.
- Nishimura, M.
- Ogawa, S.
- Onda, R.
- Ootani, W.
- Oya, A.
- Palo, D.
- Panareo, M.
- Papa, A.
- Pettinacci, V.
- Pizzigoni, G.
- Popov, A.
- Renga, F.
- Ritt, S.
- Rozhdestvensky, A.
- Rossella, M.
- Sawada, R.
- Schwendimann, P.
- Signorelli, G.
- Stoykov, A.
- Tassielli, G. F.
- Toyoda, K.
- Uchiyama, Y.
- Usami, M.
- Voena, C.
- Yanai, K.
- Yudin, Yu. V.
Publication date
January 2020
DOI Publisher
Springer Science and Business Media LLCAbstract
We present the first direct search for lepton flavour violating muon decay mediated by a new light particle X, μ+→e+X, X→γγ . This search uses a dataset resulting from 7.5×10^14 stopped muons collected by the MEG experiment at the Paul Scherrer Institut in the period 2009–2013. No significant excess is found in the mass region 20–45 MeV/c^2 for lifetimes below 40 ps, and we set the most stringent branching ratio upper limits in the mass region of 20–40 MeV/c^2, down to O(10^−11) at 90% confidence level
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