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 % C.L.). The combination of this result and the limit obtained by MEG gives B(µ+ → e+ γ) < 3.1 × 10−13 (90 % C.L.), 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+γμ+→e+γ with the first dataset of the MEG II experiment
Cattaneo P;
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 % C.L.). The combination of this result and the limit obtained by MEG gives B(µ+ → e+ γ) < 3.1 × 10−13 (90 % C.L.), 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.File in questo prodotto:
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