Speaker
Description
The VEPP-2000 e+e− collider has been operating at BINP (Novosibirsk) from 2010 in the center-of-mass energy range from 0.3 to 2 GeV. The project luminosity of this machine, exploiting the idea of the round beams, has to amount to 1032cm−2s−1. In 2017 experiments at VEPP-2000 were renewed after three year shutdown taken for new intensive positron injection source implementation as well as for upgrade of 1 GeV booster. After this upgrade the luminosity up to 5×1032cm−2s−1 was achieved. Two detectors, CMD-3 and SND, are running at two interaction regions of the VEPP-2000. Each detector collected about 120 pb-1 in the new run. Considerable statistics was taken within an energy range around the nucleon-antinucleon pair production.
Precise study of the hadrons production in e+e− annihilation at low energies provides important information about interactions of light quarks and spectroscopy of their bound states.
Precise measurements of the total hadronic cross section, characterized by the ratio R, is vitally needed for the calculation of the contribution of the hadronic vacuum polarization to the muon anomalous magnetic moment. It should be noted that at present the accuracy of the theoretical calculations of the muon (g-2) via the Standard Model is dominated by the precision of the hadronic contribution while the difference of theoretical and experimental values exceeds three standard deviations.
In this report we will discuss current status and results obtained by the of the CMD-3 experiment.
