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

Open access
Date
2018-05-01Type
- Journal Article
Abstract
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 ordinary and mirror photons of ϵ<3.1×10−7 (90% C.L.). This limit was obtained for the first time in vacuum free of systematic effects due to collisions with matter. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000269446Publication status
publishedExternal links
Journal / series
Physical Review DVolume
Pages / Article No.
Publisher
American Physical SocietyOrganisational unit
03503 - Rubbia, André / Rubbia, André
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