New Bounds from Positronium Decays on Massless Mirror Dark Photons

We present the results of a search for a hidden mirror sector in positronium decays with a sensitivity comparable with the bounds set by the prediction of the primordial He^{4} abundance from big bang nucleosynthesis. No excess of events compatible with decays into the dark sector is observed, resul...

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Bibliographic Details
Published in:Physical review letters 2020-03, Vol.124 (10), p.101803-101803, Article 101803
Main Authors: Vigo, C, Gerchow, L, Radics, B, Raaijmakers, M, Rubbia, A, Crivelli, P
Format: Article
Language:English
Subjects:
Big bang cosmology
Decay
Nuclear fusion
Nuclei (nuclear physics)
Photons
Positronium
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Summary:We present the results of a search for a hidden mirror sector in positronium decays with a sensitivity comparable with the bounds set by the prediction of the primordial He^{4} abundance from big bang nucleosynthesis. No excess of events compatible with decays into the dark sector is observed, resulting in an upper limit for the branching ratio of this process of 3.0×10^{-5} (90% C.L.). This is an order of magnitude more stringent than the current existing laboratory bounds and it constrains the mixing strength of ordinary photons to dark mirror photons at a level of ϵ
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.124.101803