The CMD-3 experiment at the VEPP-2000 collider in Novosibirsk carries out a comprehensive study of the exclusive cross-sections of e+e− → hadrons in the center-of-mass energy range from the threshold to √s < 2 GeV. The CMD-3 results provide an important input for calculation of the hadronic contribution to the muon anomalous magnetic moment. Currently there are worldwide efforts to improve the accuracy of this calculation to match the expected precision of the new experiment at Fermilab to measure muon (g-2), now taking data. The best precision is still achieved by integrating the measured total cross-section of e+e− → hadrons. The calculation is strongly dominated by low-energy data, in particular, by data at √s < 2 GeV. Other interesting topics of the CMD-3 physics program include a study of hadron cross-sections at the nucleon-antinucleon threshold and a search for two-photon production of C-even resonances. The energy scan of the whole energy range was performed in 2011-2013 and, after detector and collider upgrade and increase in luminosity by factor 2-3, in 2017-2019. The total luminosity integral collected so far is 250 pb−1. Here we present the current status of experiment and the survey of results of data analysis.
|Журнал||Proceedings of Science|
|Состояние||Опубликовано - 1 янв 2019|
|Событие||29th International Symposium on Lepton Photon Interactions at High Energies, LeptonPhoton 2019 - Toronto, Канада|
Продолжительность: 5 авг 2019 → 10 авг 2019