Limit on an exotic three-body decay of orthopositronium
- 2 January 1996
- journal article
- Published by IOP Publishing in Europhysics Letters
- Vol. 33 (2) , 111-116
- https://doi.org/10.1209/epl/i1996-00307-8
Abstract
An exotic annihilation of e+e− at rest into a single γ and a weakly interacting neutral vector boson V0 was searched for by measuring the related γ energy under the condition that no additional γ was detected by a hermetic detector. No evidence of such an annihilation was observed, resulting in the upper limits on the branching ratio of 4.2 × 10−6 (mV0 < 200 keV/c2) and 2.1 × 10−5 (mV0 < 2me = 1022 keV/c2). These upper limits were converted to those on the branching ratio of an exotic three-body decay (γγV0) of orthopositronium (o-Ps), i.e. 6.2 × 10−6 (mV0 < 200 keV/c2) and 1.7 × 10−5 (mV0 < 2me). As a result, this mode was definitely excluded as the source of the reported discrepancy in the o-Ps decay rate.Keywords
This publication has 25 references indexed in Scilit:
- Order-α corrections to the decay rate of orthopositronium in the Fried-Yennie gaugePhysical Review A, 1992
- Precision measurement of the orthopositronium decay rate using the vacuum techniquePhysical Review Letters, 1990
- On the radiative corrections α2 ln α to the positronium decay ratePhysics Letters B, 1990
- Precision measurement of the orthopositronium vacuum decay rate using the gas techniquePhysical Review A, 1989
- New precision measurement of the orthopositronium decay rate: A discrepancy with theoryPhysical Review Letters, 1987
- Radiative corrections to positronium decayAnnals of Physics, 1983
- New Precision Measurements of the Decay Rates of Singlet and Triplet PositroniumPhysical Review Letters, 1982
- Measurement of the vacuum decay rate of orthopositronium formed in an MgO-lined cavityPhysics Letters A, 1978
- Corrections to the Decay Rate of OrthopositroniumPhysical Review Letters, 1977
- Precision Measurement of the Decay Rate of Orthopositronium in SiPowdersPhysical Review Letters, 1976