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New limit on the μ+→e+γ decay with the MEG II experiment

by Molzon, W , Papa, A , Grancagnolo, F , Yonemoto, T , Umakoshi, R , Yamamoto, K , Boca, G , Nishiguchi, H , Leonetti, F , Suzuki, H , Grandoni, E. G , Voena, C , Renga, F , Ootani, W , Corvaglia, A , Matsushita, A , Kettle, P.-R , Gerritzen, L , Karpov, S , Mori, Toshinori , Scarpellini, S , Ban, S , Khomutov, N , Kolesnikov, A , Uchiyama, Y , Ferrari Barusso, L , De Gerone, M , Hildebrandt, M , Pasciuto, D , Krylov, V , Ikeda, F , De Bari, A , Mihara, S , Gallucci, G , Chiappini, M , Venturini, A , Kuchinskiy, N , Afanaciev, K , Kravchuk, N , Galli, L , Yokota, R , Popov, A , Grassi, M , Ochi, A , Rossella, M , Rozhdestvensky, A , Benmansour, H , Cei, F , Ogawa, H , Baldini, A. M , Palo, D , Vitali, B , Grigoriev, D. N , Panareo, M , Iwamoto, T , Cattaneo, P. W , Francesconi, M , Nicolò, D , Ritt, S , Malyshev, V , Signorelli, G , Takahashi, M , Oya, A , Ignatov, F , Gatti, F , Dal Maso, G , Li, W , Cavoto, G

in Astronomy / Astrophysics and Cosmology / Calibration / Datasets / Decay / Efficiency / Elementary Particles / Energy / Experiments / Hadrons / Heavy Ions / Letter / Measurement Science and Instrumentation / Nuclear Energy / Nuclear Physics / Physics / Physics and Astronomy / Quantum Field Theories / Quantum Field Theory / Sensors / String Theory

2025

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New limit on the μ+→e+γ decay with the MEG II experiment

2025

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New limit on the μ+→e+γ decay with the MEG II experiment

2025

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Journal Article

New limit on the μ+→e+γ decay with the MEG II experiment

Molzon, W,

Papa, A,

Grancagnolo, F,

Yonemoto, T,

Umakoshi, R,

Yamamoto, K,

Boca, G,

Nishiguchi, H,

Leonetti, F,

Suzuki, H,

Grandoni, E. G,

Voena, C,

Renga, F,

Ootani, W,

Corvaglia, A,

Matsushita, A,

Kettle, P.-R,

Gerritzen, L,

Karpov, S,

Mori, Toshinori,

Scarpellini, S,

Ban, S,

Khomutov, N,

Kolesnikov, A,

Uchiyama, Y,

Ferrari Barusso, L,

De Gerone, M,

Hildebrandt, M,

Pasciuto, D,

Krylov, V,

Ikeda, F,

De Bari, A,

Mihara, S,

Gallucci, G,

Chiappini, M,

Venturini, A,

Kuchinskiy, N,

Afanaciev, K,

Kravchuk, N,

Galli, L,

Yokota, R,

Popov, A,

Grassi, M,

Ochi, A,

Rossella, M,

Rozhdestvensky, A,

Benmansour, H,

Cei, F,

Ogawa, H,

Baldini, A. M,

Palo, D,

Vitali, B,

Grigoriev, D. N,

Panareo, M,

Iwamoto, T,

Cattaneo, P. W,

Francesconi, M,

Nicolò, D,

Ritt, S,

Malyshev, V,

Signorelli, G,

Takahashi, M,

Oya, A,

Ignatov, F,

Gatti, F,

Dal Maso, G,

Li, W,

Cavoto, G

2025

Overview

This letter reports the result of the search for the decay μ + → e + γ undertaken 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 the branching ratio measurement in this search is 2.2 × 10 - 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 observed data are consistent with the expected background, yielding an upper limit on the branching ratio of B ( μ + → e + γ ) < 1.5 × 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.

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Publisher

Springer Berlin Heidelberg,Springer Nature B.V,SpringerOpen

Subject

Astronomy

/ Astrophysics and Cosmology

/ Calibration

/ Datasets

/ Decay

/ Efficiency

/ Elementary Particles