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A new experiment to search for the invisible decay of the orthopositronium

Abstract : We propose an experiment to search for invisible decays of orthopositronium (o-Ps) with a 90% confidence sensitivity in the branching ratio as low as $10^{-8}$. Evidence for this decay mode would unambigously signal new physics: either the existence of extra--dimensions or fractionally charged particles or new light gauge bosons. The experimental approach and the detector components of the proposed experiment are described.
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http://hal.in2p3.fr/in2p3-00021775
Contributor : Claudine Bombar <>
Submitted on : Monday, May 10, 2004 - 4:50:01 PM
Last modification on : Friday, November 6, 2020 - 3:27:53 AM

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P. Crivelli, A. Badertscher, W. Fetscher, S.N. Gninenko, J.P. Peigneux, et al.. A new experiment to search for the invisible decay of the orthopositronium. Workshop on Positronium Physics, May 2003, Zurich, Switzerland. pp.3819-3833, ⟨10.1142/S0217751X04020099⟩. ⟨in2p3-00021775⟩

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