Search for an exotic three-body decay of orthopositronium

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dc.creatorBadertscher, A.
dc.creatorCrivelli, P.
dc.creatorFelcini, M.
dc.creatorGninenko, S. N.
dc.creatorGoloubev, N. A.
dc.creatorNedelec, P.
dc.creatorPeigneux, J. P.
dc.creatorPostoev, V.
dc.creatorRubbia, A.
dc.creatorSillou, D.
dc.date2002-06-21
dc.date.accessioned2026-07-07T10:32:11Z
dc.date.available2026-07-07T10:32:11Z
dc.descriptionWe report on a direct search for a three-body decay of the orthopositronium into a photon and two penetrating particles, o-Ps -> gamma + X1 + X2. The existence of this decay could explain the discrepancy between the measured and the predicted values of the orthopositronium decay rate. From the analysis of the collected data a single candidate event is found, consistent with the expected background. This allows to set an upper limit on the branching ratio < 4.4 \times 10^{-5} (at the 90% confidence level), for the photon energy in the range from 40 keV < E_gamma< 400 keV and for mass values in the kinematical range 0 < mX1+mX2 <900 keV. This result unambiguously excludes the o-Ps -> gamma + X1 + X2 decay mode as the origin of the discrepancy.
dc.description9 pages, 3 figures
dc.identifierhttps://arxiv.org/abs/hep-ex/0206054
dc.identifierhttp://arxiv.org/abs/hep-ex/0206054
dc.identifierPhys.Lett.B542:29-34,2002
dc.identifierdoi:10.1016/S0370-2693(02)02237-2
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/178668
dc.subjectHigh Energy Physics - Experiment
dc.titleSearch for an exotic three-body decay of orthopositronium
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