Abstract
The CMD-3 detector is installed at the VEPP-2000 e+e− collider at BINP (Novosibirsk, Russia). It is a general-purpose detector, equipped with a tracking system, two crystal (CSI and BGO) calorimeters, liquid Xe calorimeter, TOF and muon systems. The main goal of experiments at CMD-3 is a study of exclusive modes of e+e−→ hadrons at energies $ \sqrt s \le $ GeV. In particular, these results provide an important input for calculation of the hadronic contribution to the muon anomalous magnetic moment. The first round of data taking was performed in 2011–2013, when about 60 1/pb were taken in the center-of-mass (c.m.) energy range from 0.32 to 2.0 GeV. Here we present a survey of results of data analysis. Between 2013 and 2016 the collider and the detector were upgraded. The data taking resumed by the end of 2016. In the first run after the upgrade about 50 1/pb were collected at the energy range between 1.28 and 2.007 GeV. We discuss the upgrade and the first preliminary results from the new data.
Highlights
The electron-positron collider VEPP-2000[1, 2] started operation at Budker Institute o√f Nuclear Physics (Novosibirsk, Russia) in 2010
CMD-3[3] and SND[4] are installed in the two interaction regions of VEPP-2000
The Liquid Xenon (LXe) calorimeter has 7 layers and utilizes dual readout: the anode signals are used for a measurement of the total energy deposition, while signals from the cathode strips provide information about a shower profile and are used to measure the coordinates of the photon conversion point to 1-2 mm precision
Summary
The first round of data taking was performed in 2011–2013, when about 60 1/pb were taken in the center-of-mass (c.m.) energy range from 0.32 to 2.0 GeV. In the first run after the upgrade about 50 1/pb were collected at the energy range between 1.28 and 2.007 GeV. The primary goal of experiments at VEPP-2000 is a measurement of cross sections of various modes of e+e− → hadrons in the whole available c.m. energy range up to 2 GeV.
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