New constraint on the existence of the &lt;em&gt;μ&lt;/em&gt;&lt;sup&gt;+&lt;/sup&gt; → &lt;em&gt;e&lt;/em&gt;&lt;sup&gt;+&lt;/sup&gt;&lt;em&gt;γ&lt;/em&gt; decay

Adam, J.; Bai, X.; Baldini, A.M.; Baracchini, E.; Bemporad, C.; Boca, G.; Cattaneo, P.W.; Cavoto, G.; Cei, F.; Cerri, C.; Egger, J.; Galli, L.; Hildebrandt, M.; Kettle, P.-R.; Kiselev, O.; Natori, H.; Papa, A.; Renga, F.; Ritt, S.; Uchiyama, Y.; Zanello, D.

doi:10.1103/PhysRevLett.110.201801

New constraint on the existence of the μ⁺ → e⁺γ decay

Adam J, Bai X, Baldini AM, Baracchini E, Bemporad C, Boca G, Cattaneo PW, Cavoto G, Cei F, Cerri C, Egger J, Galli L, Hildebrandt M, Kettle P-R, Kiselev O, Natori H, Papa A, Renga F, Ritt S, Uchiyama Y, Zanello D, et al.

Citation

Adam, J., Bai, X., Baldini, A. M., Baracchini, E., Bemporad, C., Boca, G., … Zanello, D. (2013). New constraint on the existence of the μ⁺ → e⁺γ decay. Physical Review Letters, 110(20), 201801 (5 pp.). https://doi.org/10.1103/PhysRevLett.110.201801

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:10135

The analysis of a combined data set, totaling 3.6 × 10¹⁴ stopped muons on target, in the search for the lepton flavor violating decay μ⁺ → e⁺γ is presented. The data collected by the MEG experiment at the Paul Scherrer Institut show no excess of events compared to background expectations and yield a new upper limit on the branching ratio of this decay of 5.7 × 10^-13 (90% confidence level). This represents a four times more stringent limit than the previous world best limit set by MEG.

Details

Publication Type

Journal Article

Title

New constraint on the existence of the μ⁺ → e⁺γ decay

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