Alexander Romanov

Study of e+e-→ωπ0→π0π0γ in the energy range 1.05-2.00 GeV with the SND detector

The cross section for the process e+e- --> omega pi0 --> pi0 pi0 gamma has been measured in the energy range 1.05--2.00 GeV. The experiment has been performed at the e+e- collider VEPP-2000 with the SND detector. The measured e+e- --> omega pi0 cross section above 1.4 GeV is the most accurate to date. Below 1.4 GeV our data are in good agreement with the previous SND and CMD-2 measurements. Data on the e+e- --> omega pi0 cross section are well described by the VMD model with two excited rho-like states. From the measured cross section we have extracted the gamma^* --> omega pi0 transition form factor. It has been found that the VDM model cannot describe simultaneously our data and data obtained from the omega --> pi0 mu+ mu- decay. We have also tested CVC hypothesis comparing our results on the e+e- --> omega pi0 cross section with data on the tau- --> omega pi- nu_{tau} decay.

Study of the process

The

e^+e^-\to\eta\gamma

e^+e^-toetagamma

in the center-of-mass energy range 1.07--2.00 GeV

cross section has been measured in the center-of-mass energy range 1.07--2.00 GeV using the decay mode

Study of e+e- --> omega pi0 --> pi0 pi0 gamma in the energy range 1.05--2.00 GeV with SND

etato 3pi^0

Recent Beam-Beam Effects at VEPP-2000 and VEPP-4M

,

Study of

pi^0to gammagamma

e^+e^- \to \omega\pi^0 \to \pi^0\pi^0\gamma

. The analysis is based on 36 pb

in the energy range

^{-1}

1.05-2.00

of integrated luminosity collected with the SND detector at the VEPP-2000