THE ORTHOPOSITRONIUM DECAY PUZZLE AND PRIMORDIAL NUCLEOSYNTHESIS

Details THE ORTHOPOSITRONIUM DECAY PUZZLE AND PRIMORDIAL NUCLEOSYNTHESIS THE ORTHOPOSITRONIUM DECAY PUZZLE AND PRIMORDIAL NUCLEOSYNTHESIS

1995-05-31

arxiv.org/abs/hep-ph/9505443v1

Phys.Lett. B356 (1995) 313-318

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, LaTeX file, 1 figure in a compressed uuencoded additional file. Full postscript file available at ftp://ftp.ifae.e

Scientific paper

10.1016/0370-2693(95)00797-O

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 of the order of 10^{-3}. We show that considerations based on primordial nucleosynthesis and effective Lagrangians place a very stringent upper bound: B = Gamma(o-Ps -> ``exotic'' + ...)/Gamma(o-Ps) <= 2 x 10^{-15}, ruling out the exotic decay solution to the puzzle.

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