Abstract
We report the results of a search for the decay in the kinematic region with momentum using the data collected by the E787 experiment at BNL. No events were observed. When combined with our previous search in this region, one candidate event with an expected background of events results in a 90% C.L. upper limit of on the branching ratio of We also report improved limits on the rates of and where are hypothetical, massless, long-lived neutral particles.
- Received 20 April 2004
DOI:https://doi.org/10.1103/PhysRevD.70.037102
©2004 American Physical Society