First search for invisible decays of ortho-positronium confined in a vacuum cavity

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Vigo, C.; Gerchow, L.; Liszkay, L.; Rubbia, A.; Crivelli, P.;
(2018)

The experimental setup and results of the first search for invisible decays of ortho-positronium (o-Ps) confined in a vacuum cavity are reported. No evidence of invisible decays at a level $\text{Br}\left(\text{o-Ps}\to\text{invisible}\right) < 5.9\times 10^{-4}$ (90% C... View more
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