Search for the lepton flavour violating decay $$\mu ^+ \rightarrow \mathrm {e}^+ \gamma $$ μ + → e + γ with the full dataset of the MEG experiment

Baldini, A.; Bao, Yuhai; Baracchini, E.; Bemporad, C.; Berg, F.; Biasotti, M.; Boca, G.; Cascella, M.; Cattaneo, P. W.; Cavoto, G.; Cei, F.; Cerri, C.; Chiarello, G.; Chiri, C.; Corvaglia, A.; Bari, A. de; Gerone, M. De; Doke, T.; D’onofrio, A.; Dussoni, S.; Egger, J.; Fujii, Yuki; Galli, L.; Gatti, F.; Grancagnolo, F.; Grassi, M.; Graziosi, A.; Grigoriev, D. N.; Haruyama, T.; Hildebrandt, M.; Hodge, Z.; Ieki, K.; Ignatov, F.V.; Iwamoto, T.; Kaneko, Daisuke; Kang, T. I.; Kettle, P.-R.; Khazin, B.I.; Khomutov, N. V.; Korenchenko, A. S.; Kravchuk, N.; Lim, G.; Maki, A.; Mihara, S.; Molzon, W.; Mori, T.; Morsani, F.; Mtchedilishvili, A.; Mzavia, D.; Nakaura, S.; Nardo, R. Di; Nicolò, D.; Nishiguchi, H.; Nishimura, Mikio; Ogawa, S.; Ootani, W.; Orito, S.; Panareo, M.; Papa, A.; Pazzi, R.; Pepino, A.; Piredda, G.; Pizzigoni, G.; Popov, Alexander; Raffaelli, F.; Renga, F.; Ripiccini, E.; Ritt, S.; Rossella, M.; Rutar, G.; Sawada, R.; Sergiampietri, F.; Signorelli, G.; Simonetta, M.; Tassielli, G. F.; Tenchini, F.; Uchiyama, Y.; Venturini, Marco; Voena, C.; Yamamoto, A.; Yoshida, Keisuke; You, Z.; Yudin, Yu. V.; Zanello, D.

doi:10.1140/epjc/s10052-016-4271-x

articleThe European Physical Journal CAug 1, 2016DIAMOND OA

Search for the lepton flavour violating decay $$\mu ^+ \rightarrow \mathrm {e}^+ \gamma $$ μ + → e + γ with the full dataset of the MEG experiment

ABA. Baldini YBYuhai Bao EBE. Baracchini CBC. Bemporad FBF. Berg

Istituto Nazionale di Fisica Nucleare, Sezione di Pisa · Paul Scherrer Institute · +17 more institutions

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Abstract

The final results of the search for the lepton flavour violating decay Î1⁄4+â e+Î3 based on the full dataset collected by the MEG experiment at the Paul Scherrer Institut in the period 2009â2013 and totalling 7.5 Ã 1014stopped muons on target are presented. No significant excess of events is observed in the dataset with respect to the expected background and a new upper limit on the branching ratio of this decay of B(Î1⁄4+â e+Î3) &lt; 4.2 Ã 10- 13(90Â&nbsp;% confidence level) is established, which represents the most stringent limit on the existence of this decay to date.

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Topics & keywords

Topics

Keywords

Physics
Lepton
Muon
Particle physics
Branching fraction
Flavour
Nuclear physics
Limit (mathematics)

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