Improved upper limit on Muonium to Antimuonium Conversion

Details Improved upper limit on Muonium to Antimuonium Conversion Improved upper limit on Muonium to Antimuonium Conversion

1998-05-17

arxiv.org/abs/nucl-ex/9805005v1

Phys.Rev.Lett.77:1950-1953,1996

Physics

Nuclear Physics

Nuclear Experiment

Scientific paper

10.1103/PhysRevLett.77.1950

A new experiment has been set up at the Paul Scherrer Institut to search for muonium to antimuonium conversion. No event was found to fulfil the requested signature which consists of the coincident detection of both constituents of the antiatom in its decay. Assuming an effective (V-A)$\times$(V-A) type interaction an improved upper limit is established for the conversion probability of ${\rm P_{M\bar{M}}} \leq 8 \cdot 10^{-9}$ (90%C.L.), which is almost two orders of magnitude lower compared to previous results and provides a sensitive test for theoretical extensions of the standard model.

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