اشترك بالحزمة الذهبية واحصل على وصول غير محدود شمرا أكاديميا
تسجيل مستخدم جديدExperimental study of the e^+e^-topi^+pi^-pi^0 reaction by SND detector in the energy range sqrt{s}=0.42--1.38 GeV
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The review of the SND results of the $e^+e^-topi^+pi^-pi^0$ process study in the energy range $sqrt[]{s}=0.42$ -- 1.38 GeV at VEPP-2M collider, based on about $2times 10^6$ selected events, is presented. The total cross section, parameters of the $rho$, $omega$, $phi$ resonances, and $omega^prime$, $omega^{primeprime}$ states were obtained. It was found that $rhopi$ and $omegapi^0$ intermediate states describe the reaction dynamics. The experimental data cannot be described by a sum of only $omega$, $phi$, $omega^prime$ and $omega^{primeprime}$ resonances contributions. This can be interpreted as a manifestation of the $rhoto 3pi$ decay, suppressed by $G$-parity, with relative probability $B(rhoto 3pi) = (1.01pm^{0.54}_{0.36}pm 0.034) times 10^{-4}$.
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In the experiment with the SND detector at VEPP-2M e^+e^- collider the process $e^+e^-topi^+pi^-pi^0$ was studied in the energy range 2E_0 from 1.04 to 1.38 GeV. A broad peak was observed with the visible mass $M_{vis}=1220pm 20$ MeV and cross sectio
n in the maximum $sigma_0simeq 4$ nb. The peak can be interpreted as a $omega$-like resonance $omega (1200)$.
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^+pi^-pi^0$ and $omegapi^+pi^-$ cross sections obtained in other experiments, was analyzed in the framework of the generalized vector meson dominance model. It was found that the experimental data can be described by a sum of $omega$, $phi$ mesons and two $omega^prime$ and $omega^{primeprime}$ resonances contributions, with masses $m_{omega^prime}sim 1490$,$m_{omega^{primeprime}}sim 1790$ MeV and widths $Gamma_{omega^prime}sim 1210$, $Gamma_{omega^{primeprime}}sim 560$ MeV. The analysis of the $pi^+pi^-$ invariant mass spectra in the energy region $sqrt[]{s}$ from 1100 to 1380 MeV has shown that for their descriptionone should take into account the $e^+e^-toomegapi^0topi^+pi^-pi^0$ mechanism also. The phase between the amplitudes corresponding to the $e^+e^-toomegapi$ and $e^+e^-torhopi$ intermediate states was measured for the first time. The value of the phase is close to zero and depends on energy.
We present a measurement of the $e^+e^-to K_SK_L$ cross section in the energy range $sqrt{s}=1.04 div 1.38$ GeV. For the energy $sqrt{s}geq 1.2$ GeV the cross section exceeds vector meson dominance model predictions with only $rho(770)$, $omega(783)$
, and $phi(1020)$ mesons taken into account. Measured cross section agrees well with previous measurements.
The process $e^+e^-toomegaetapi^0$ is studied in the energy range $1.45-2.00$ GeV using data with an integrated luminosity of 33 pb$^{-1}$ accumulated by the SND detector at the $e^+e^-$ collider VEPP-2000. The $e^+e^-toomegaetapi^0$ cross section is
measured for the first time. The cross section has a threshold near 1.75 GeV. Its value is about 2 nb in the energy range $1.8-2.0$ GeV. The dominant intermediate state for the process $e^+e^- to omegaetapi^0$ is found to be $omega a_0(980)$.
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