Observation of the double Dalitz decay η′ → e+ e− e+ e− M. Ablikim, M. N. Achasov, P. Adlarson [et al.]
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ArticleContent type: Текст Media type: электронный Subject(s): Далица двойной распад | BESIII, детектор | BEPCII, коллайдерGenre/Form: статьи в журналах Online resources: Click here to access online
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Physical Review D Vol. 105, № 11. P. 112010-1-112010-8Abstract: Based on (0087 +/- 44) x 10(6) J/psi events collected with the BESIII detector at BEPCII, the double Dalitz decay eta' -> e(+)e(-)e(+)e(-) is observed for the first time via the J/psi -> gamma eta' decay process. The significance is found to be 5.7s with systematic uncertainties taken into consideration. Its branching fraction is determined to be B(eta' -> e(+)e(-)e(+)e(-)) = (4.5 +/- 1.0(stat) +/- 0.5(sys)) x 10(-6).
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Based on (0087 +/- 44) x 10(6) J/psi events collected with the BESIII detector at BEPCII, the double Dalitz decay eta' -> e(+)e(-)e(+)e(-) is observed for the first time via the J/psi -> gamma eta' decay process. The significance is found to be 5.7s with systematic uncertainties taken into consideration. Its branching fraction is determined to be B(eta' -> e(+)e(-)e(+)e(-)) = (4.5 +/- 1.0(stat) +/- 0.5(sys)) x 10(-6).
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