CH-5232 Villigen PSI, Switzerland
1PSI, Paul-Scherrer-Institut,
CH-5232 Villigen-PSI, Switzerland
2IPP,
Institut für Teilchenphysik der ETHZ
, CH-5232 Villigen-PSI, Switzerland
3
Physics Department, University of
Virginia, Charlottesville, Virginia 22901,USA.
4Institute
of High Energy Physics, Chinese Academy of Science, Beijing 100039,
The People's Republic of China
We have searched for the rare pion-decay p+ ® m+ X where X is a neutral particle of mass 33.9 MeV, a process suggested by the KARMEN Collaboration [1] to explain an anomaly seen in their time spectrum of neutrino induced reactions. By measuring the muon momentum spectrum of charged pions decaying in flight using the pE1 high intensity pion channel at PSI, we were able to place an upper limit on the branching fraction h of such decays, at the level of h < 6.0·10-10 with a 95% confidence level.
Publications
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Publications Related to the KARMEN Anomaly |
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KARMEN Homepage |
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Information on the pE1 Beamline |
