1999
DOI: 10.1016/s0370-2693(98)01507-x
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Search for exotic muon decays

Abstract: 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 µ + → 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 = 103.9 MeV/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 spectr… Show more

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Cited by 20 publications
(20 citation statements)
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“…A recent experiment found no evidence for such a decay mode down to a branching fraction of 5.7 3 10 24 (90% C.L.) [6].…”
mentioning
confidence: 92%
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“…A recent experiment found no evidence for such a decay mode down to a branching fraction of 5.7 3 10 24 (90% C.L.) [6].…”
mentioning
confidence: 92%
“…A recent experiment found no evidence for such a decay mode down to a branching fraction of 5.7 3 10 24 (90% C.L.) [6].The mass of X originating from decay (1) is very similar to the mass difference between the charged pion and the muon, m p 1 2 m m 1 ͑33.911 57 6 0.000 67͒ MeV [7(a),8]. Thus, the resulting small Q value makes it prohibitive to look for such a particle in "heavy neutrino searches" from pions decaying at rest [9-12].…”
mentioning
confidence: 93%
“…Wilczek suggested such a model [9] which may lead to CLFV where the boson X can be emitted in flavor changing interactions. Such new bosons have been sought by experiments using kaon [10][11][12][13][14][15], pion [16,17], and muon decays [18][19][20][21][22].…”
Section: Introductionmentioning
confidence: 99%
“…Exotic muon decays were also sought as a byproduct of the π þ → e þ ν branching ratio measurement [23] by Bryman and Clifford [19] using a NaIðTlÞ calorimeter, resulting in upper limits on the branching ratio ≲3 × 10 −4 in the mass range from 39.3 to 93.4 MeV=c 2 . Muon decay in the mass region up to the kinetic limit was studied by Bilger et al [20] using a germanium detector. The most sensitive experiment done so far by Bayes et al [21] gave limits from 10 −5 to 10 −6 in the mass range from 3.2 to 86.6 MeV=c 2 .…”
Section: Introductionmentioning
confidence: 99%
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