Geodesic
Decay of a bound state of A $\mu^+\mu^-$ pair into an $e^+e^-$ Dalitz pair and A photon
Teoretičeskaâ i matematičeskaâ fizika, Tome 60 (1984) no. 1, pp. 24-36 
G. A. Kozlov; S. P. Kuleshov; V. I. Savrin; V. V. Sanadze; N. B. Skachkov. Decay of a bound state of A $\mu^+\mu^-$ pair into an $e^+e^-$ Dalitz pair and A photon. Teoretičeskaâ i matematičeskaâ fizika, Tome 60 (1984) no. 1, pp. 24-36. http://geodesic.mathdoc.fr/item/TMF_1984_60_1_a2/
@article{TMF_1984_60_1_a2,
     author = {G. A. Kozlov and S. P. Kuleshov and V. I. Savrin and V. V. Sanadze and N. B. Skachkov},
     title = {Decay of a bound state of {A} $\mu^+\mu^-$ pair into an $e^+e^-$ {Dalitz} pair and {A} photon},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {24--36},
     year = {1984},
     volume = {60},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1984_60_1_a2/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

The form factor of the decay of a bound $\mu^+\mu^-$ system in a state with total spin equal to zero into a $e^+e^-$ pair and a $\gamma$ photon is investigated. The probability of decay of the $\mu^+\mu^-$ bound state into two photons is calculated. If the mass of the $\mu$ meson in the obtained expression is replaced by the electron mass, the resulting probability obtained for the decay of parapositronium into two photons agrees with the experimental data.

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