Energy Range 920 – 1380 MeV at CMD - 2
نویسندگان
چکیده
The cross section of the process e+e− → ωπ0 → π0π0γ has been measured in the c.m. energy range 920–1380 MeV with the CMD-2 detector. Its energy dependence is well described by the interference of the ρ(770) and ρ(1450) mesons decaying to ωπ. Upper limits for the cross sections of the direct processes e+e− → π0π0γ, ηπ0γ have been set.
منابع مشابه
Study of the Process e + e − → ωπ 0 → π 0 π 0 γ in c.m. Energy Range 920–1380 MeV at CMD-2
The cross section of the process e+e− → ωπ0 → π0π0γ has been measured in the c.m. energy range 920–1380 MeV with the CMD-2 detector. Its energy dependence is well described by the interference of the ρ(770) and ρ(1450) mesons decaying to ωπ0. Upper limits for the cross sections of the direct processes e+e− → π0π0γ, ηπ0γ have been set.
متن کاملin c . m . Energy Range 600 - 1380 MeV at CMD - 2
The cross section of the process e+e− → ηγ has been measured in the 600-1380 MeV c.m. energy range with the CMD-2 detector. The following branching ratios have been determined: B(ρ → ηγ) = (3.28 ± 0.37 ± 0.23) · 10 , B(ω → ηγ) = (5.10 ± 0.72 ± 0.34) · 10 , B(φ → ηγ) = (1.287 ± 0.013 ± 0.063) · 10 . Evidence for the ρ(1450) → ηγ decay has been obtained for the first time. Budker Institute of Nuc...
متن کامل-meson Study with Cmd-2 Detector at Vepp-2m Collider at Novosibirsk
The e + e ? collider VEPP-2M at Novosibirsk is the only machine covering the energy range 360-1400 MeV. The peak luminosity is 5: 10 30 cm ?2 s ?1 for the resonance region. Two modern detectors-the general purpose magnetic detector CMD-2 and Spherical Neutral Detector (SND) are taking data at the VEPP-2M collider. The integrated luminosity about 10 pb ?1 has been collected by both detectors. La...
متن کامل+ e − pair with the CMD - 2 detector
Using 3.3 pb of data collected with the CMD-2 detector in the 720 – 840 MeV c.m. energy range, the branching fraction of the conversion decay ω → πee has been measured: B(ω → πee) = (8.19 ± 0.71± 0.62) · 10. The upper limits for the branching fractions of the following conversion decays have been obtained at the 90% confidence level: B(ρ → πee) < 1.6 · 10, B(ρ → ηee) < 0.7 · 10 and B(ω → ηee) <...
متن کاملRecent Results from the Cmd-2 Detector at the Vepp-2m Collider
The general-purpose detector CMD-2 is taking data at the Novosibirsk VEPP-2M ee collider in the energy range 360{1400MeV, with luminosity of 5:0 10 cm 2 s 1 for the resonance region. Data from 1500 nb 1 of integrated luminosity around 1.02 GeV and 500 nb 1 in the 600{1000 MeV range have been collected and preliminary analyses performed. We present progress in studies of the meson and KSKL syste...
متن کامل