A.N. Skrinsky

Electromagnetic Pion Form-Factor in the Timelike Region

Abstract The pion electromagnetic form factor has been measured at the VEPP-2M collider in the c.m. energy range 360 MeV–1400 MeV with the detectors OLYA and CMD. On the basis of all available data for the pion form factor collected in the timelike region, the following values for ρ-meson parameters were obtained: m ρ = 775.9 ± 1.1 MeV, σ ρ = 150.5 ± 3.0 MeV. The ω-meson branching ratio into π + π − pair, electromagnetic radius of the pion, ππ scattering length in the P-wave and the strong interaction contribution to the muon ( g − 2) value were found to be B ωππ = (2.3 ± 0.4)%, 〈 r π 2 〉 = 0.422 ± 0.013 fm 2 , a 1 1 = 0.033 ± 0.033m π −3 , a H = (68.4 ± 1.1) × 10 −9 .

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.

Measurement of e+e- → π+π- cross-section with CMD-2 around ρ-meson

The cross section of the process e+e- ->pi+pi- has been measured using about 114000 events collected by the CMD-2 detector at the VEPP-2M e+e- collider in the center-of-mass energy range from 0.61 to 0.96 GeV. Results of the pion form factor determination with a 0.6% systematic uncertainty are presented. Implications for the hadronic contribution to the muon anomalous magnetic moment are discussed.

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.

Summary of experiments with the neutral detector at the e+e− storage ring VEPP-2M

Abstract The complete results of the experiments carried out with the Neutral Detector at the e + e − storage ring VEPP-2M in the energy range 2 E =0.5–1.4 GeV are reviewed. The data sample corresponds to a total integrated luminosity of 19 pb −1 .

Study of the φ decays into π0π0γ and ηπ0γ final states

Radiative decays of the

Measurement of the e + e - → π+π- cross section with the CMD-2 detector in the 370-520-MeV energy range

\phi

Update of the e+e− → π+π− cross section measured by the spherical neutral detector in the energy region 400 < √s < 1000 MeV

meson have been studied using a data sample of about 19 million

a1(1260)π dominance in the process e+e−→4π at energies 1.05–1.38 GeV

\phi

Measurement of the Pion Form Factor in the Range 1.04 1.38 GeV with the CMD-2 Detector

decays collected by the CMD-2 detector at VEPP-2M collider in Novosibirsk. From selected