The CMD-3 detector is taking data at the VEPP-2000 e+e− collider (Budker INP, Novosibirsk, Russia). The main goal of experiments with CMD-3 is the measurement of the cross-sections and dynamics of the exclusive modes of e+e− annihilation to hadrons. In particular, these results provide an important input for calculations of the hadronic contribution to the muon anomalous magnetic moment. The first round of data taking with the CMD-3 detector was performed in 2011-2013 with about 60 1/pb integrated luminosity in the center-of-mass (c.m.) energy range from 0.32 to 2.0 GeV. The collected data sample exceeds those in all previous experiments. Here we present the survey of results of data taken in 2011-2013, including a precise measurement of the e+e− → π+π− reaction as well as other hadron final states with up to six pions or states including two kaons. At the end of 2016 the VEPP-2000 collider resumed operation after upgrade of the injection system, and performance approaching the project luminosity of 1032 cm−2s−1 at 2 GeV has been demonstrated. Preliminary results of the new 2017 run are also presented.
|Journal||Proceedings of Science|
|Publication status||Published - 1 Jan 2017|
|Event||2017 European Physical Society Conference on High Energy Physics, EPS-HEP 2017 - Venice, Italy|
Duration: 5 Jul 2017 → 12 Jul 2017