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تسجيل مستخدم جديدNew Data from SND Detector in Novosibirsk
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The current status of experiments with SND detector at VEPP-2M e^+e^- collider in the energy range 2E_0=400-1400 MeV and recent results of data analysis for $phi$, $omega$ and $rho$ decays and e^+e^- annihilation into hadrons are presented.
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The processes $e^+e^-tomu^+mu^-$ and $e^+e^-topi^+pi^-$ have been studied with SND detector at VEPP-2M $e^+e^-$ collider in the vicinity of $phi(1020)$ resonance. The branching ratios $B(phitomu^+mu^-)=(3.30pm 0.45pm 0.32)times 10^{-4}$ and $B(phitop
i^+pi^-)=(0.71pm 0.11pm 0.09)times 10^{-4}$ were obtained.
The review of experimental results obtained with SND detector at VEPP-2M $e^+e^-$ collider in the energy region $sqrt[]{s}=0.36$ -- 1.38 GeV is given. The presented results include the following items: studies of the light vector mesons radiative dec
ays, OZI-rule and G-parity suppressed $phi$-meson rare decays, $phi$-meson parameters measurements, studies of $e^+e^-topi^+pi^-pi^0$ process dynamics, $eta$ and $K_S$ mesons rare decays, $eta$ and $phi$ mesons conversion decays, and study of the $e^+e^-$ annihilation into hadrons.
The current status of experiments with SND detector at VEPP-2M $e^+e^-$ collider in the energy range $2E_0=0.4-1.4$ GeV is given. The new results of analysis of $phi$ decay into $pi^0pi^0gamma$, $etapi^0gamma$ are based on the full SND statistics cor
responding 20 million of $phi$ decay. New measurement of $omegatopi^0pi^0gamma$ decay and a first observation of $rhotopi^0pi^0gamma$ are presented. The accuracy of many other rare decays of light vector mesons was improved. In the energy range $2E_0=1.0div1.4$ GeV the cross sections of the processes $e^+e^-toomegapi^0$ and $e^+e^-topi^+pi^-pi^0$ were measured. The results of the fitting of data are discussed.
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 experi
ment), 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.
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.
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