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First results of the study of the process e+e- \to 4\pi by the CMD-2 collaboration at VEPP-2M are presented for the energy range 1.05--1.38 GeV. Using an integrated luminosity of 5.8 pb^{-1}, energy dependence of the processes e+e- \to \pi^+\pi^- 2\pi^0 and e+e- \to 2\pi^+ 2\pi^- has been measured. Analysis of the differential distributions demonstrates the dominance of the a_1\pi and \omega\pi intermediate states. Upper limits for the contributions of other alternative mechanisms are also placed.

3 data tables match query

Table 1

Energy dependence of the cross section for the 2PI+ 2PI- final state. Statistical errors only.

Table 2

Energy dependence of the cross section for the PI+ PI- 2PI0 final state. Statistical errors only.

Table 3

Energy dependence of the cross section for the OMEGA PI0 final state. Statistical errors only.

Experiments at VEPP-2M with SND detector

The SND collaboration Achasov, M.N. ; Aulchenko, V.M. ; Baru, S.E. ; et al.

BINP-98-65, 1998.

Inspire Record 476386 DOI 10.17182/hepdata.50374

Short overview of experiments with SND detector at VEPP-2M e^+e^- collider in the energy range 2E = 400 - 1400 MeV and preliminary results of data analysis are presented.

4 data tables match query

Table 1

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Table 2

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Table 3

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rivet Analysis
The process $e^+e^-\to\pi^+\pi^-\pi^0$ in the energy range 2E_0=1.04 - 1.38 GeV

Achasov, M.N. ; Aulchenko, V.M. ; Baru, S.E. ; et al.

Phys.Lett.B 462 (1999) 365-370, 1999.

Inspire Record 508003 DOI 10.17182/hepdata.28071

In the experiment with the SND detector at VEPP-2M e^+e^- collider the process $e^+e^-\to\pi^+\pi^-\pi^0$ was studied in the energy range 2E_0 from 1.04 to 1.38 GeV. A broad peak was observed with the visible mass $M_{vis}=1220\pm 20$ MeV and cross section in the maximum $\sigma_0\simeq 4$ nb. The peak can be interpreted as a $\omega$-like resonance $\omega (1200)$.

1 data table match query

Table 1

The total cross section for E+ E- --> PI+ PI- PI0 after correction for efficiency and radiative effects.

rivet Analysis
The process e+ e- --> omega pi0 --> pi0 pi0 gamma up to 1.4-GeV.

Achasov, M.N. ; Beloborodov, K.I. ; Berdyugin, A.V. ; et al.

Phys.Lett.B 486 (2000) 29-34, 2000.

Inspire Record 527752 DOI 10.17182/hepdata.41747

The cross section of the $e^+e^-\to\omega\pi^0\to\pi^0\pi^0\gamma$ reaction was measured by the SND detector at VEPP-2M $e^+e^-$ collider in the energy range from threshold up to 1.4 GeV. Results of the cross section fitting by the sum of $\rho$, $\rho^{\prime}$ and $\rho^{\prime\prime}$ contributions are presented.

1 data table match query

Table 1

Only statistical errors are presented.

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CM Energies (GeV)

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Investigation of polarization of the photoprotons from the c-12 nucleus at the gamma-quanta energy of 550-715 mev

Angular distributions of the asymmetry of the gamma p ---> p pi0 reaction with the gamma-quanta energies of 400, 450, 500, 550, 650 mev

Measurement of Asymmetry of Photoproduction of Positive Pions on Protons by Linearly Polarized Photons in 250-MeV-500-MeV Energy Range

Single Photoproduction of Negative Pions from Neutrons by Linearly Polarized Photons in the Region of the First Pion-Nucleon Resonance

Form factor ...

Search for a Possible Exotic State C (1480) at the Vepp-2m Storage Ring

rivet Analysis
a_1(1260) dominance in the process e+e- \to 4\pi at energies 1.05--1.38 GeV

Experiments at VEPP-2M with SND detector

rivet Analysis
The process $e^+e^-\to\pi^+\pi^-\pi^0$ in the energy range 2E_0=1.04 - 1.38 GeV

rivet Analysis
The process e+ e- --> omega pi0 --> pi0 pi0 gamma up to 1.4-GeV.