A. S. Zaitsev

Update: A reanalysis of hadronic cross section measurements at CMD-2

The updated results of the precise measurements of the processes e+e-->rho->pi+pi-, e+e-->omega->pi+pi-pi0 and e+e-->phi->KLKS performed by the CMD-2 collaboration are presented. The update appeared necessary due an overestimate of the integrated luminosity in previous analyses.

High-statistics measurement of the pion form factor in the ρ-meson energy range with the CMD-2 detector

We present a measurement of the pion form factor based on e+e- annihilation data from the CMD-2 detector in the energy range 0.6<sqrt(s)<1.0 GeV with a systematic uncertainty of 0.8%. A data sample is five times larger than that used in our previous measurement.

Total cross section of the process e+e- → π+π-π+π- in the c.m. energy range 980-1380 MeV

Abstract The e + e − → π + π − π + π − cross section has been measured using 5.8 pb −1 of integrated luminosity collected with the CMD-2 detector at the VEPP-2M collider. Analysis of the data with a refined efficiency determination and use of both three- and four-track events allowed doubling of a data sample and reduction of systematic errors to 5–7%.

Study of the process e+e−→ηγ in c.m. energy range 600–1380 MeV at CMD-2

The cross section of the process e+ e- --> pi0 pi0 gamma has been measured in the c.m. energy range 600--970 MeV with the CMD-2 detector. The following branching ratios have been determined: B(rho --> pi0 pi0 gamma) =(5.2^{+1.5}_{-1.3} +- 0.6)x10^{-5} and B(omega --> pi0 pi0 gamma) =(6.4^{+2.4}_{-2.0} +- 0.8)x10^{-5}. Evidence for the rho --> f0(600) gamma decay has been obtained: B(rho --> f0(600) gamma) = (6.0^{+3.3}_{-2.7}\pm 0.9)x10^{-5}. From a search for the process e+ e- --> eta pi0 gamma the following upper limit has been obtained: B(omega --> eta pi0 gamma) < 3.3 10^{-5} at 90% CL.

Study of the ρ and ω meson decays into a pseudoscalar meson and e+e- pair with the CMD-2 detector

Using 3.3 pb

Study of the process e+e- → ωπ0 → π0π0γ in c.m. energy range 920-1380 MeV at CMD-2

^{-1}

Study of ϕ→π+π−π0 with CMD-2 detector

of data collected with the CMD-2 detector in the 720 -- 840 MeV c.m. energy range, the branching fraction of the conversion decay

Study of Φ → π+π-π0 with CMD-2 detector

\omega\to\pi^0e^+e^-

Study of φ → π + π − π 0 with CMD-2 detector

has been measured:

Recent results of the study of hadronic production with the CMD-2 and SND detectors at the VEPP-2M collider

\mathcal{B}(\omega\to\pi^0e^+e^-)=(8.19\pm0.71\pm0.62)\cdot10^{-4}