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A search for $\mu^+\to e^+\gamma$ with the first dataset of the MEG II experiment

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arxiv 2310.12614 v3 pith:MX7JG44P submitted 2023-10-19 hep-ex

classification hep-ex
keywords gammalimitdataexperimentfirstresultsearchtimes
verification ladder T0 review T1 audit T2 compute T3 formal
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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 $\mu^+\to e^+\gamma$ 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($\mu^+\to e^+\gamma$) < $7.5 \times 10^{-13}$ (90% C.L.). The combination of this result and the limit obtained by MEG gives B($\mu^+\to e^+\gamma$) < $3.1 \times 10^{-13}$ (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.

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