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- W2020498051 abstract "Motivated by the recently reported discrepancy between measured and theoretical values for the orthopositronium lifetime, we have searched for exotic decay of orthopositronium into ensuremath{gamma} plus a long-lived neutral particle X, in the hitherto unexplored mass region of ${m}_{x}$ below 100 keV. Our negative result provides new upper limits of 6.4ifmmodetimeselsetexttimesfi{}${10}^{mathrm{ensuremath{-}}5}$ to 7.6ifmmodetimeselsetexttimesfi{}${10}^{mathrm{ensuremath{-}}6}$ on the branching ratio of such decay. Consequently we exclude the hypothesis of Samuel, i.e., that a new pseudoscalar particle with mass less than 5.7 keV is responsible for the discrepancy of the orthopositronium lifetime." @default.
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- W2020498051 date "1989-08-07" @default.
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- W2020498051 title "New limits on exotic two-body decay of orthopositronium" @default.
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- W2020498051 doi "https://doi.org/10.1103/physrevlett.63.597" @default.
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