Abstract
The discrepancy between the experimental decay rate of orthopositronium (o-Ps) and the QED theoretical prediction can be solved by invoking decays of o-Ps into exotic particles with branching ratios ∼ 10 −3. We show that considerations based on primordial nucleosynthesis and effective Lagrangians place a very stringent upper bound: B ≡ Γ (o-Ps → “exotic” + …) Γ(o-Ps) ≤ 2 × 10 −15 , ruling out the exotic decay solution to the puzzle.
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