A search for ^+ →e^+ with the first dataset of the MEG II experiment

K. Afanaciev,A. M. Baldini,S. Ban,V. Baranov,H. Benmansour,M. Biasotti,G. Boca,P. W. Cattaneo,G. Cavoto,F. Cei,M. Chiappini,G. Chiarello,A. Corvaglia,F. Cuna,G. Dal Maso,A. De Bari,M. De Gerone,L. Ferrari Barusso,M. Francesconi,L. Galli,G. Gallucci,F. Gatti,L. Gerritzen,F. Grancagnolo, E. G. Grandoni,M. Grassi,D. N. Grigoriev,M. Hildebrandt,K. Ieki,F. Ignatov,F. Ikeda,T. Iwamoto,S. Karpov,P.-R. Kettle,N. Khomutov, S. Kobayashi, A. Kolesnikov,N. Kravchuk, V. Krylov, N. Kuchinskiy,W. Kyle,T. Libeiro,V. Malyshev, A. Matsushita,M. Meucci,S. Mihara,W. Molzon,Toshinori Mori,M. Nakao,D. Nicolò,H. Nishiguchi, A. Ochi,S. Ogawa,R. Onda,W. Ootani,A. Oya,D. Palo,M. Panareo,A. Papa,V. Pettinacci,A. Popov,F. Renga,S. Ritt,M. Rossella,A. Rozhdestvensky,P. Schwendimann, K. Shimada,G. Signorelli, M. Takahashi,G. F. Tassielli, K. Toyoda,Y. Uchiyama,M. Usami,A. Venturini,B. Vitali,C. Voena, K. Yamamoto,K. Yanai,T. Yonemoto,K. Yoshida,Yu. V. Yudin

The European Physical Journal C（2024）

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Abstract

The MEG II experiment, based at the Paul Scherrer Institut in Switzerland, reports the result of a search for the decay ^+ →e^+ from data taken in the first physics run in 2021. No excess of events over the expected background is observed, yielding an upper limit on the branching ratio of ℬ ( ^+ →e^+ ) < 7.5 × 10^-13 (90 ℬ ( ^+ →e^+ ) < 3.1 × 10^-13 (90

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