## The mean life of the neutral pi meson |

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Appendix approximately assume Barkas Physics Research Bevatron bias branching ratio calculated cell length confidence interval coordinates Dalitz mode decay mode determined dip angle electron Emulsion Plane estimated events observed experiment experimental gap length Gaussian function Ilford incident jt interaction point intersection interval Koristka laboratory-system opening angles Lawrence Radiation Laboratory Least-Squares Straight-Line Fit likelihood function mean-life evaluation measured tt meson minimum-ionizing tracks multiple-scattering measurements negative pion nuclear emulsion number of grains obtained opening-angle distribution optimum number path length microns path relative photons Physics Research Group PI MESON precision microscope Primakoff primary tt probability Projected angle projected path length relativistic rest energy rest frame s/ctt sagitta second differences secondary charged pions shown in Fig shrinkage factor small opening angles space angle star center straight line Tollestrup total number transverse momentum tt events tt mean tt path length unmeasured w(sa