Observation of the decay J=? ? e plus e- ?(1405) with ?(1405) ? ?0f 0(980)
Küçük Resim Yok
Tarih
2024
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Amer Physical Soc
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Using a data sample of (10087 +/- 44) x 106 J=psi events collected by the BESIII detector in 2009, 2012, 2018 and 2019, the electromagnetic Dalitz process J=psi -> e+e-eta(1405) is observed via the decay eta(1405) -> pi 0f0(980), f0(980) -> pi+pi-, with a significance of about 9.8 sigma. The branching fraction of this decay is measured to be B(J=psi -> e+e-eta(1405)-> e+e- pi 0f0(980) -> e+e- pi 0 pi+ pi-)=(2.04 +/- 0.20(stat)+/- 0.08(syst))x 10-7. The branching fraction ratio B(J=psi -> e+e- eta(1405))=B(J=psi -> gamma eta(1405)) is determined to be (1.36 +/- 0.17(stat) +/- 0.06(syst)) x 10-2. Furthermore, an e+e- invariant mass dependent transition form factor of J=psi -> e+e-eta(1405) is presented for the first time. The obtained result provides input for different theoretical models and is valuable for the improved understanding the intrinsic structure of the eta(1405) meson.
Açıklama
Anahtar Kelimeler
Gaseous-Hydrogen, Final-States, Annihilations, E(+)E(-), Rest, Tof
Kaynak
Physical Review D
WoS Q Değeri
N/A
Scopus Q Değeri
Q1
Cilt
109
Sayı
1
