We present the first direct search for lepton flavour violating muon decay mediated by a new light particle X, μ+→e+X,X→γγ. This search uses a dataset resulting from 7.5 × 10 14 stopped muons collected by the MEG experiment at the Paul Scherrer Institut in the period 2009–2013. No significant excess is found in the mass region 20–45 MeV/c2 for lifetimes below 40 ps, and we set the most stringent branching ratio upper limits in the mass region of 20–40 MeV/c2, down to O(10 - 11) at 90% confidence level.
Search for lepton flavour violating muon decay mediated by a new light particle in the MEG experiment / Baldini, A.M., Berg, F., Biasotti, M., Boca, G., Cattaneo, P.W., Cavoto, G., Cei, F., Chiappini, M., Chiarello, G., Chiri, C., Corvaglia, A., de Bari, A., De Gerone, M., Francesconi, M., Galli, L., Gatti, F., Grancagnolo, F., Grassi, M., Grigoriev, D.N., Hildebrandt, M., et al.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - 80:9(2020). [10.1140/epjc/s10052-020-8364-1]
Search for lepton flavour violating muon decay mediated by a new light particle in the MEG experiment
Cavoto G.Membro del Collaboration Group
;Chiarello G.Membro del Collaboration Group
;Meucci M.;Voena C.;
2020
Abstract
We present the first direct search for lepton flavour violating muon decay mediated by a new light particle X, μ+→e+X,X→γγ. This search uses a dataset resulting from 7.5 × 10 14 stopped muons collected by the MEG experiment at the Paul Scherrer Institut in the period 2009–2013. No significant excess is found in the mass region 20–45 MeV/c2 for lifetimes below 40 ps, and we set the most stringent branching ratio upper limits in the mass region of 20–40 MeV/c2, down to O(10 - 11) at 90% confidence level.| File | Dimensione | Formato | |
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