Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2000-08-08
Phys.Rev.Lett.85:1815-1818,2000
Physics
High Energy Physics
High Energy Physics - Experiment
17 pages including 4 for figures
Scientific paper
10.1103/PhysRevLett.85.1815
We have searched for the pion decay pi^+ --> mu^+ X, where X is a neutral particle of mass 33.905 MeV. This process was suggested by the KARMEN Collaboration to explain an anomaly in their observed time distribution of neutrino induced reactions. Having measured the muon momentum spectrum of charged pions decaying in flight, we find no evidence for this process and place an upper limit on the branching fraction eta leq 6.0 * 10^{-10} of such a decay at a 95% confidence level.
Daum M.
Janousch M.
Kettle P.-R.
Koglin Jason
Pocanic Dinko
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