Abstract
A search for the rare decay has been carried out at the Lawrence Berkeley Laboratory using a sparkostrictive wire-chamber spectrometer. Analysis programs identified events with three tracks or with two tracks of which one was an electron and the other a positron. Analysis of the three-track events yields a branching ratio (90% confidence). The two-track events, analyzed by searching for sparks on a possible pion track, yield a limit of (90% confidence). The latter value implies that the coupling constant for a vector neutral current must be about three orders of magnitude smaller than the coupling constant for the charged vector current.
- Received 17 April 1974
DOI:https://doi.org/10.1103/PhysRevD.10.776
©1974 American Physical Society