HEPData Search

The rr- + p- n + rr0 charge-exchange scattering and the rr- + p- n + 1J ( 1J- 2y) reaction were investigated in 1.55-4.5 BeVIc region in a 17-liter propane-xenon bubble chamber. The total cross sections of both reactions were measured in this region. The angular distributions of the rr0 mesons in the charge-exchange reaction were obtained. The backward exchange-scattering cross sections du( rr- + p- n + rr 0 )ldQ were estimated.

3 data tables

Table 1

No description provided.

Table 2

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Table 3

No description provided.

rivet Analysis
Processes e+ e- --> K+ K-, K(S) K(L) and pi+ pi- pi0 at the Phi(1020) resonance energy region.

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

Phys.Rev.D 63 (2001) 072002, 2001.

Inspire Record 533574 DOI 10.17182/hepdata.41706

The cross sections of the processes $e^+e^- \to K^+K^-$, $e^+e^- \to K_SK_L$ and $e^+e^- \to \pi^+\pi^-\pi^0$ were measured in the SND experiment at the VEPP-2M collider in the energy region near the $\phi(1020)$ meson. These measurements were based on about $10^6$ $K^+K^-$, $0.5 \times 10^6$ $K_SK_L$ and $0.4 \times 10^6$ $\pi^+\pi^-\pi^0$ selected events. Themeasured cross sections have been analyzed in the framework of the vector meson dominance model and the main parameters of the $\phi$-resonance were obtained, such as its mass, width, the production cross section and branching ratios of the main decay modes. The measured value of the $\phi$ meson total width, $\Gamma_{\phi} = 4.21 \pm 0.04$ is lower than the present world average of $4.458 \pm 0.032$ MeV. Contributions in addition to the conventional vector meson dominance model were found in the $e^+e^- \to \pi^+\pi^-\pi^0$ reaction cross section.

2 data tables

Table 1

Scan PHI9801 (see text). Point-to-point systematic errors are due to model uncertainty.

Table 2

Scan PHI9802 (see text). Point-to-point systematic errors are due to model uncertainty.

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

Table 1

Only statistical errors are presented.

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

Table 1

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

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

Table 1

No description provided.

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Table 3

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Search for d' in pion inclusive spectra from p p interactions.

Abramov, B.M. ; Bulychjov, Sergey A. ; Khanov, A.I. ; et al.

Eur.Phys.J.A 1 (1998) 115-116, 1998.

Inspire Record 468080 DOI 10.17182/hepdata.43711

We report on our measurement of the inclusive spectrum of positive pions from the reaction pp→π++X on a CH2 internal target of the ITEP proton synchrotron at 1.5 GeV/c with a missing

1 data table

Table 1

No description provided.

First physical results from SND detector at VEPP-2M.

The SND collaboration Achasov, M.N. ; Beck, M.G. ; Beloborodov, K.I. ; et al.

BUDKER-INP-1997-78, 1997.

Inspire Record 450009 DOI 10.17182/hepdata.50302

The paper describes experiments with the SND detector at VEPP-2M collider, carried out during the period from October 1995 until June 1997. The total integrated luminosity of 6.4 pb^{-1} was collected in the energy range 2E=0.4-1.4 GeV (MHAD97 experiment), corresponding to 4*10^5 mu^+ mu^- pairs produced. Preliminary results of the 1996 phi-meson experiment (FI96) are presented. The total number of phi-mesons produced is 4*10^6. New data on rare decays of phi and eta (550) mesons, in particular B(phi -> eta gamma) = (1.30+-0.06+-0.07)%, B(phi -> pi^0 pi^0 gamma) = (1.1+-0.2)*10^{-4}, (M_{pi^0 pi^0} > 800 MeV), B(phi -> f^0 gamma) = (4.7+-1.0)*10^{-4}, B(phi -> eta pi^0 gamma) = (1.3+-0.5)*10^{-4}, B(phi -> eta' gamma) < 1.7*10^{-4}, B(phi -> 2 pi^0 ) < 6*10^{-4} were obtained.

4 data tables

Table 1

No description provided.

Table 2

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Table 3

No description provided.

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