First search for invisible decays of orthopositronium confined in a vacuum cavity

Carlos Vigo, Lars Gerchow, László Liszkay, André Rubbia & Paolo Crivelli
The experimental setup and results of the first search for invisible decays of orthopositronium (o-Ps) confined in a vacuum cavity are reported. No evidence of invisible decays at a level Br(o−Ps→invisible)<5.9×10−1 (90% C.L.) was found. This decay channel is predicted in hidden sector models such as the mirror matter (MM), which could be a candidate for dark matter. Analyzed within the MM context, this result provides an upper limit on the kinetic mixing strength between...
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