A.E. Kuzmenko

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 .

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^-

\pm

in the c.m. energy range 920–1060 MeV with the CMD-3 detector

93 signal events from a data sample corresponding to an integrated luminosity of 9.8 pb

MEASUREMENT OF THE

^{-1}

e^+e^- \to p \bar{p}

collected with the CMD-3 detector in the center-of-mass energy range 920--1060 MeV. The measured cross section exhibits an interference pattern of the

CROSS SECTION WITH THE CMD-3 DETECTOR AT VEPP-2000

\phi(1020)\to\pipi\pipi