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A new upper limit for the decay μ→eee

Authors:	SINDRUM Collaboration W Bertl R Eichler L Felawka and H K Walter G Bowden S Egli R Engfer Ch Grab E A Hermes D Herter P Heusi N Kraus R J Powers H S Pruys and A vd Schaaf J J Domingo J Jansen N Lordong and J Mergaert J Martino

Institution:	Institut für Mittelenergiephysik der ETHZ, CH-5234, Villigen, Switzerland Physik-Institut der Universität Zürich, CH-8001, Zürich, Switzerland Schweizerisches Institut für Nuklearforschung, CH-5234, Villigen, Switzerland CEN Saclay, DPhN-HE, F-91191, Gif-sur-Yvette Cedex, France

Abstract:	A search for the decay μ⁺→e⁺e⁺e^?, in which no candidate was found, yields a new upper limit for the branching ratio R_μ→3e<1.6×10^?10 (90% confidence). A total of 16 decays were observed, in agreement both in number and momentum distribution with V - A theory.

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