Protonium annihilation intoπ0π0at rest in a liquid hydrogen target

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Abstract

The annihilation frequency of the reaction $\overline{p}\stackrel{\ensuremath{\rightarrow}}{p}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ at rest in liquid hydrogen has been measured by the Obelix experiment by using different apparatus configurations and trigger conditions. The value obtained is $f({\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0},$ $\mathrm{LH})=(2.8\ifmmode\pm\else\textpm\fi{}{0.1}_{\mathrm{stat}}\ifmmode\pm\else\textpm\fi{}{0.4}_{\mathrm{syst}})\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}.$ With the same data samples, the ${\ensuremath{\pi}}^{0}\ensuremath{\eta}$ annihilation frequency has been determined to be $f({\ensuremath{\pi}}^{0}\ensuremath{\eta},$ $\mathrm{LH})=(0.9\ifmmode\pm\else\textpm\fi{}{0.2}_{\mathrm{stat}}\ifmmode\pm\else\textpm\fi{}{0.1}_{\mathrm{syst}})\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}.$ The results are discussed within the frame of the present experimental situation.

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