Year: 2025
Type: preprint
Abstract: This letter reports the result of the search for the decay μ+->e+γundertaken at the Paul Scherrer Institut in Switzerland with the MEG II experiment using the data collected in the 2021- 2022 physics runs. The sensitivity of this search is 2.2x10-13, a factor of 2.4 better than that of the full MEG dataset and obtained in a data taking period of about one fourth that of MEG, thanks to the superior performances of the new detector. The result is consistent with the expected background, yielding an upper limit on the branching ratio of B(μ+->e+γ)<1.5 x 10-13 (90 % C.L.). Additional improvements are expected with the data collected during the years 2023-2024. The data-taking will continue in the coming years.
Source: arXiv (Cornell University)
Authors: Afanaciev, K., Baldini, A. M., Ban, S., Benmansour, H., Boca, G., Cattaneo, P. W., Cavoto, G., Cei, F., Chiappini, M., Corvaglia, A., Maso, G. Dal, De Bari, A., De Gerone, M., Barusso, L. Ferrari, Francesconi, M., Galli, L., Gallucci, G., Gatti, F., Gerritzen, L., Grancagnolo, F., Grandoni, E. G., Grassi, M., Grigoriev, D. N., Hildebrandt, M., Ignatov, F., Ikeda, F., Iwamoto, T., Karpov, S., Kettle, P. -R., Khomutov, N., Kolesnikov, A., Kravchuk, N., Krylov, V., Kuchinskiy, N., Leonetti, F., Li, W., Malyshev, V., Matsushita, A., Mihara, S., Moltzon, W., Mori, Toshinori, Nicolo', D., Nishiguchi, H., Ochi, A., Ogawa, H., Ootani, W., Oya, A., Palo, D., Panareo, M., Papa, A., Pasciuto, D., Popov, A., Renga, F., Ritt, S., Rossella, M., Rozhdestvensky, A., Scarpellini, S., Signorelli, G., Suzuki, H., Takahashi, M., Uchiyama, Y., Umakoshi, R., Venturini, A., Vitali, B., Voena, C., Yamamoto, K., Yokota, R., Yonemoto, T.
Institutions: Joint Institute for Nuclear Research, Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, The University of Tokyo, Istituto Nazionale di Fisica Nucleare, Sezione di Pavia, Istituto Nazionale di Fisica Nucleare, Istituto Nazionale di Fisica Nucleare, Sezione di Roma I, Sapienza University of Rome, University of Salento, Istituto Nazionale di Fisica Nucleare, Sezione di Lecce, Istituto Nazionale di Fisica Nucleare, Sezione di Genova, Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Budker Institute of Nuclear Physics, Novosibirsk State Technical University, Paul Scherrer Institute, University of Liverpool, High Energy Accelerator Research Organization, University of California, Irvine, Kobe University
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: Data Acquisition System for the MEG II Experiment - Follow up, Data Acquisition System for the MEG II Experiment, G298171496, G3042553669, MEG II Experiment - Highest Sensitivity Search for Rare Muon Decay to Explore Grand Unified Theories, A RESEARCH PROGRAM IN NEUTRINO PHYSICS, COSMIC RAYS, AND ELEMENTARY PARTICLES, G4106844606, 松果体を介する概日性リズムの調節における視床下部視交又上核の役割並びにその化学感受性について, Fundamental Muon Physics at the Paul Scherrer Institute, G628552264, Promotion of muon particle physics in an international framework, Charged lepton flavour violation and exotic physics searches with the MEGII and Mu3e experiments, Fundamental Muon Physics at the Paul Scherrer Institute, Search for rare muon decay with highest sensitivity to unravel grand unification of elementary particle, Precision Test on Lepton Universality Violation with Large High-Resolution Liquid Xenon Detector, G993971353
OpenAlex ID: W6979310662
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