Abstract
A general phenomenological method for studying a two-pion mass spectrum is developed; it is shown that, without assumptions about the production mechanism of the two-pion system, no significant upper limit on the branching ratio can be set with present-day experiments. In general, a lower limit may be set if a significant effect is seen. This method is applied to data containing more than events. The lower-momentum half of the sample, which shows a significant signal, was published previously but is here reanalyzed to set a lower limit on the branching ratio. The new data at higher momenta show no significant signal. The results from the various momenta are shown to be consistent.
- Received 13 May 1969
DOI:https://doi.org/10.1103/PhysRevD.1.1
©1970 American Physical Society