The orthopositronium decay puzzle and primordial nucleosynthesis

R. Escribano, E. Massó, R. Toldrà

Research output: Contribution to journalArticleResearchpeer-review

9 Citations (Scopus)


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. © 1995.
Original languageEnglish
Pages (from-to)313-318
JournalPhysics Letters B
Issue number2-3
Publication statusPublished - 17 Aug 1995


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