-meson Study with Cmd-2 Detector at Vepp-2m Collider at Novosibirsk

The e + e ? collider VEPP-2M at Novosibirsk is the only machine covering the energy range 360-1400 MeV. The peak luminosity is 5: 10 30 cm ?2 s ?1 for the resonance region. Two modern detectors-the general purpose magnetic detector CMD-2 and Spherical Neutral Detector (SND) are taking data at the VEPP-2M collider. The integrated luminosity about 10 pb ?1 has been collected by both detectors. Latest results from CMD-2 detector at region are presented in this paper. The VEPP-2M collider at the Budker Institute of Nuclear Physics in Novosi-birsk, Russia, shown in Figure 1 covers the center of mass energy range from the two pion threshold up to 1400 MeV 1]. Experiments at this collider yielded a number of important results in e + e ? physics, including the most precise pion form factor measurements 2] and studies of the , !, and meson decays 3, 4]. During 1988-92 it was upgraded with a new booster to allow higher positron currents and injection of the electron and positron beams directly at the beam energy. After installation of the new booster, VEPP-2M has peak luminosity L 5: 10 30 cm ?2 s ?1 at 40 mA per beam at the center of mass energy.