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.File in questo prodotto:
Non ci sono file associati a questo prodotto.
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
