A.N. Kozyrev

Study of the process e+e−→pp¯ in the c.m. energy range from threshold to 2 GeV with the CMD-3 detector

Abstract Using a data sample of 7.7 pb − 1 collected with the CMD-3 detector at the VEPP-2000 e + e − collider we select about 2900 events of the process e + e − → p p ¯ and measure its cross section at 12 energy points with about 6% systematic uncertainty. From the angular distribution of produced nucleons we obtain the ratio G E / G M .

CsI calorimeter of the CMD-3 detector

The VEPP-2000 e+e− collider has been operated at Budker Institute of Nuclear Physics since 2010. The experiments are performed with two detectors CMD-3 and SND. The calorimetry at the CMD-3 detector is based on three subsystems, two coaxial barrel calorimeters—Liquid Xenon Calorimeter and crystal CsI calorimeter, and endcap calorimeter with BGO crystals. This paper describes the CsI calorimeter of the CMD-3 detector. The calorimeter design, its electronics and calibration procedures are discussed.

The CMD-3 TOMA DAQ infrastructure

An upgrade of the CMD-3 detector for the VEPP-2000 e+e− collider is now in progress at the Budker Institute of Nuclear Physics (BINP) in Novosibirsk. CMD-3 is equipped with a TOMA (Time Oriented Measurement and Acquire) DAQ system specially developed for the experiments at low energy e+e− colliders. The CMD-3 TOMA DAQ has a high grade of unification, which decreases the cost of ownership and production time of the whole system. Unification also makes it possible to reduce the variety, the price and the production time of the DAQ modules. Special attention is paid to the synchronization of the data transmission and on-line checks of electronics. The communication between DAQ elements is realized via a custom developed interface named C-Link. Several types of DAQ TOMA modules are briefly described.

Combined Liquid Xenon and crystal CsI calorimeter of the CMD-3 detector

The barrel electromagnetic calorimeter of the CMD-3 detector consists of two subsystems: the Liquid Xenon calorimeter and the calorimeter based on CsI scintillation crystals. Its structure and main characteristics are presented. The energy calibration procedures of the combined calorimeter are described.

Study of the process e+e− → π+π−π+π− in the c.m. energy range 920–1060 MeV with the CMD-3 detector

The cross section of the process ee → πππη has been measured using a data sample of 21.8 pb collected with the CMD-3 detector at the Corresponding author: solodov@inp.nsk.su Preprint submitted to Elsevier May 6, 2018 VEPP-2000 ee collider. 2769±95 signal events have been selected in the center-of-mass energy range 1394–2005 MeV. The production dynamics is dominated by the ω(782)η and φ(1020)η intermediate states in the lower energy range, and by the a0(980)ρ(770) intermediate state at higher energies.

Current status of luminosity measurement with the CMD-3 detector at the VEPP-2000

Since December 2010 the CMD-3 detector has taken data at the electron-positron collider VEPP-2000. The collected data sample corresponds to an integrated luminosity of 60 pb−1 in the c.m. energy from 0.32 up to 2 GeV. The preliminary results of the luminosity measurement are presented in various energy ranges. The current accuracy for integrated luminosity is estimated to be 1%.

e^+e^-

A cross section of the process

collider

e^+e^- \to \pipi\pipi

Study of the process

has been measured using 6798

e^+e^-\to \pi^+\pi^-\pi^+\pi^-

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