The MEG II experiment, based at the Paul Scherrer Institut in Switzerland, reports the result of a search for the decay μ+→e+γ 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(μ+→e+γ)<7.5×10-13 (90% CL). The combination of this result and the limit obtained by MEG gives B(μ+→e+γ)<3.1×10-13 (90% CL), which is the most stringent limit to date. A ten-fold larger sample of data is being collected during the years 2022–2023, and data-taking will continue in the coming years.

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

Baldini A. M.;Benmansour H.;Biasotti M.;Cavoto G.;Cei F.;Chiappini M.;Cuna F.;Francesconi M.;Galli L.;Gatti F.;Grandoni E. G.;Grassi M.;Kyle W.;Nicolo D.;Papa A.;Signorelli G.;Venturini A.;Vitali B.;Yoshida K.;
2024-01-01

Abstract

The MEG II experiment, based at the Paul Scherrer Institut in Switzerland, reports the result of a search for the decay μ+→e+γ 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(μ+→e+γ)<7.5×10-13 (90% CL). The combination of this result and the limit obtained by MEG gives B(μ+→e+γ)<3.1×10-13 (90% CL), which is the most stringent limit to date. A ten-fold larger sample of data is being collected during the years 2022–2023, and data-taking will continue in the coming years.
2024
Afanaciev, K.; Baldini, A. M.; Ban, S.; Baranov, V.; Benmansour, H.; Biasotti, M.; Boca, G.; Cattaneo, P. W.; Cavoto, G.; Cei, F.; Chiappini, M.; Chia...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/1235908
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