Search for a light dark photon in muonium decay

About 0.85 × 10 5 events involving stopped μ + and muonium decay were observed in a nuclear photoemulsion with the aim of searches for a light dark photon (DPh) in the decay process DPh → e + e − . With a probability of about 10 −5 , no event of the decay μ + → е + ν μ ν е accompanied by an electron...

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Bibliographic Details
Published in:Physics of atomic nuclei 2017-05, Vol.80 (3), p.461-464
Main Authors: Dubinina, V. V., Egorenkova, N. P., Pozharova, E. A., Polukhina, N. G., Smirnitsky, V. A., Starkov, N. I.
Format: Article
Language:English
Subjects:
DECAY
Diamond pyramid hardness
ELECTRON-POSITRON COLLISIONS
ELECTRONS
Elementary Particles and Fields Theory
MEV RANGE 01-10
MEV RANGE 10-100
MUONIUM
Particle and Nuclear Physics
PHOTOGRAPHIC EMULSIONS
PHOTONS
Physics
Physics and Astronomy
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
POSITRONS
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Summary:About 0.85 × 10 5 events involving stopped μ + and muonium decay were observed in a nuclear photoemulsion with the aim of searches for a light dark photon (DPh) in the decay process DPh → e + e − . With a probability of about 10 −5 , no event of the decay μ + → е + ν μ ν е accompanied by an electron–positron pair was observed. In the interval of 1.1 MeV ≤ m DPh ≤ 60 MeV, the mixing parameter ε 2 was estimated at about 10 −5 to 10 −4 .
ISSN:1063-7788
1562-692X
DOI:10.1134/S106377881703005X