New Constraint on the Existence of the μ+e+γ Decay

J. Adam et al. (MEG Collaboration)
Phys. Rev. Lett. 110, 201801 – Published 13 May 2013

Abstract

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 5.7×1013 (90% confidence level). This represents a four times more stringent limit than the previous world best limit set by MEG.

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  • Received 5 March 2013

DOI:https://doi.org/10.1103/PhysRevLett.110.201801

© 2013 American Physical Society

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Vol. 110, Iss. 20 — 17 May 2013

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