A search for μ+→e+γ with the first dataset of the MEG II experiment
- Autori: Afanaciev K.; Baldini A.M.; Ban S.; Baranov V.; Benmansour H.; Biasotti M.; Boca G.; Cattaneo P.W.; Cavoto G.; Cei F.; Chiappini M.; Chiarello G.; Corvaglia A.; Cuna F.; Maso G.D.; De Bari A.; De Gerone M.; Barusso L.F.; Francesconi M.; Galli L.; Gallucci G.; Gatti F.; Gerritzen L.; Grancagnolo F.; Grandoni E.G.; Grassi M.; Grigoriev D.N.; Hildebrandt M.; Ieki K.; Ignatov F.; Ikeda F.; Iwamoto T.; Karpov S.; Kettle P.R.; Khomutov N.; Kobayashi S.; Kolesnikov A.; Kravchuk N.; Krylov V.; Kuchinskiy N.; Kyle W.; Libeiro T.; Malyshev V.; Matsushita A.; Meucci M.; Mihara S.; Molzon W.; Mori T.; Nakao M.; Nicolò D.; Nishiguchi H.; Ochi A.; Ogawa S.; Onda R.; Ootani W.; Oya A.; Palo D.; Panareo M.; Papa A.; Pettinacci V.; Popov A.; Renga F.; Ritt S.; Rossella M.; Rozhdestvensky A.; Schwendimann P.; Shimada K.; Signorelli G.; Takahashi M.; Tassielli G.F.; Toyoda K.; Uchiyama Y.; Usami M.; Venturini A.; Vitali B.; Voena C.; Yamamoto K.; Yanai K.; Yonemoto T.; Yoshida K.; Yudin Y.V.
- Anno di pubblicazione: 2024
- Tipologia: Articolo in rivista
- OA Link: http://hdl.handle.net/10447/639813
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.