Solution of Orthopositronium lifetime Puzzle

Details Solution of Orthopositronium lifetime Puzzle Solution of Orthopositronium lifetime Puzzle

2003-08-11

arxiv.org/abs/hep-ex/0308031v1

Int.J.Mod.Phys. A19 (2004) 3927-3938

Physics

High Energy Physics

High Energy Physics - Experiment

Scientific paper

10.1142/S0217751X0402018X

The intrinsic decay rate of orthopositronium formed in ${\rm SiO_2}$ powder is measured using the direct $2\gamma$ correction method such that the time dependence of the pick-off annihilation rate is precisely determined. The decay rate of orthopositronium is found to be $7.0396\pm0.0012 (stat.)\pm0.0011 (sys.)\mu s^{-1}$, which is consistent with our previous measurements with about twice the accuracy. Results agree well with the $O(\alpha^2)$ QED prediction, and also with a result reported very recently using nanoporous film.

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