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The selection of neutral pions with a high purity while maintaining also
a high efficiency can be important in the formation of statistically
significant mass spectra in the reconstruction of short-lived particles
such as the omega meson ($\omega \rightarrow \pi^{+} \pi^{-} \pi^{0}$).
In this study a Ranking method is described and detailed results
from a Monte-Carlo study are presented. The results show that the Ranking
method, when applied to high multiplicity events, yields significant
improvements in the purity of selected pion candidates and facilitates
the relaxation of standard cuts thereby avoiding some systematic
uncertainties.
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