IS THERE A NEW PSEUDOSCALAR PARTICLE?
- 1 September 1988
- journal article
- research article
- Published by World Scientific Pub Co Pte Ltd in Modern Physics Letters A
- Vol. 03 (11) , 1117-1123
- https://doi.org/10.1142/s0217732388001331
Abstract
The decay rate of orthopositronium has recently been measured in a new high precision experiment. The result is 10 standard deviations above the theoretical value. It is shown that a light neutral pseudoscalar R may resolve this discrepancy and still be consistent with the anomalous magnetic moments of the electron and the muon. If the mass mR≤5.7 keV , then the existence of this proposed particle R is consistent with the beam-dump experiments. The lifetime of R is large, τ≥0.14 s.Keywords
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