Search for Exotic Muon Decays

Details Search for Exotic Muon Decays Search for Exotic Muon Decays

1998-11-15

arxiv.org/abs/hep-ph/9811333v1

Phys.Lett. B446 (1999) 363-367

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages

Scientific paper

10.1016/S0370-2693(98)01507-X

Recently, it has been proposed that the observed anomaly in the time distribution of neutrino induced reactions, reported by the KARMEN collaboration, can be interpreted as a signal from an exotic muon decay branch mu+ to e+ X. It has been shown that this hypothesis gives an acceptable fit to the KARMEN data if the boson X has a mass of m_X=103.9MeV/c^2, close to the kinematical limit. We have performed a search for the X particle by studying for the first time the very low energy part of the Michel spectrum in mu+ decays. Using a HPGe detector setup at the muE4 beamline at PSI we find branching ratios BR(mu+ to e+ X)<5.7e-4 (90% C.L.) for most of the region 103MeV/c^2

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