VEPP-4 is a multipurpose storage ring facility at Budker Institute of Nuclear Physics
(Novosibirsk, Russia) with several research programs including high energy physics in …

The beam energy measurement system (BEMS) for the upgraded Beijing electron–positron
collider BEPC-II is described. The system is based on measuring the energies of Compton …

The KEDR detector is a universal magnetic detector designed for studying the c-and b-
quarks and two-photon physics, and is employed at the VEPP-4M e+ e− collider. A specific …

A new high precision measurement of the J/ψ-and ψ′-meson masses has been performed
at the VEPP-4M collider using the KEDR detector. The resonant depolarization method has …

We present the analysis of all KEDR data on the determination of J/ψ and ψ (2 S) masses.
The data comprise six scans of J/ψ and seven scans of ψ (2 S) which were performed at the …

Using the KEDR detector at the VEPP-4M e+ e− collider, we have measured the values of R
uds and R at seven points of the center-of-mass energy between 3.12 and 3.72 GeV. The …

The present work continues a series of the KEDR measurements of the R value that started
in 2010 at the VEPP-4M e+ e− collider. By combining new data with our previous results in …

An accurate knowledge of the colliding beam energies is essential for the current
experiments with the KEDR detector at the VEPP-4M collider. Now the experimental activity …

A precise τ lepton mass measurement performed at the VEPP-4M collider with the KEDR
detector is reported. The mass value is evaluated from the τ+ τ− cross section behavior …

Using the KEDR detector at the VEPP-4M e+ e− collider, we have determined the values of
R at thirteen points of the center-of-mass energy between 1.84 and 3.05 GeV. The achieved …