The MEG II experiment, based at the Paul Scherrer Institut in Switzerland, reports the result of a search for the decay mu(+)-> 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(+)-> e(+)gamma) <7.5x10(-13) (90% CL). The combination of this result and the limit obtained by MEG gives B (mu(+)-> e(+)gamma) <3.1x10(-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 $$\upmu ^+ \rightarrow \textrm{e}^+ \upgamma $$ with the first dataset of the MEG II experiment
Biasotti, M.;De Gerone, M.;Ferrari Barusso, L.;Gallucci, G.;Gatti, F.;
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 mu(+)-> 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(+)-> e(+)gamma) <7.5x10(-13) (90% CL). The combination of this result and the limit obtained by MEG gives B (mu(+)-> e(+)gamma) <3.1x10(-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.
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