Yayın: Observation of electromagnetic Dalitz decays J=ψ → Pe+e−
Dosyalar
Tarih
Kurum Yazarları
Yazarlar
Ablikim, M.
Achasov, M. N.
Ai, X. C.
Albayrak, O.
Albrecht, M.
Ambrose, D. J.
An, F. F.
An, Q.
Bai, J. Z.
Ferroli, R. Baldini
Danışman
Dil
Türü
Yayıncı:
Amer Physical
Dergi Başlığı
Dergi ISSN
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Özet
Based on a sample of (225.3 +/- 2.8) x 10(6) J/psi events collected with the BESIII detector, the electromagnetic Dalitz decays of J/psi -> Pe(+)e(-)(P = eta'/eta/pi(0)) are studied. By reconstructing the pseudoscalar mesons in various decay modes, the decays J/psi -> eta'e(+)e(-), J/psi -> eta e(+)e(-), and J/psi -> pi(0)e(+)e(-) are observed for the first time. The branching fractions are determined to be B(J/psi -> eta'e(+)e(-)) = (5.81 +/- 0.16 +/- 0.31) x 10(-5), B(J/psi -> eta e(+)e(-)) = (1.16 +/- 0.07 +/- 0.06) x 10(-5), and B(J/psi -> pi(0)e(+)e(-)) = (7.56 +/- 1.32 +/- 0.50) x 10(-7), where the first errors are statistical and the second ones systematic.
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Konusu
Transition form-factors, Omega, Meson, Pair, Phi, Astronomy & astrophysics, Physics