In the first part of the report related to the data analysis, the results of the study of the process with the CMD-3 detector at the VEPP-2000 collider (Budker Institute of Nuclear Physics, Novosibirsk) will be described. The process was studied in the center-of-mass energy range from 1.59 to 2.007 GeV using the data sample of 59.5 collected in 2011, 2012 and 2017. The process cross section was measured with a systematic uncertainty of 5.1% on the basis of 3009 67 selected events, the meson parameters were determined from the cross-section approximation.In the first part of the report related to the data analysis, the results of the study of the process with the CMD-3 detector at the VEPP-2000 collider (Budker Institute of Nuclear Physics, Novosibirsk) will be described. The process was studied in the center-of-mass energy range from 1.59 to 2.007 GeV using the data sample of 59.5 collected in 2011, 2012 and 2017. The process cross section was measured with a systematic uncertainty of 5.1% on the basis of 3009 67 selected events, the meson parameters were determined from the cross-section approximation.

In the second, methodical part of the dissertation, a novel method for the charged particle identification developed for the CMD-3 detector will be described. The method is based on the application of BDT classifiers (Boosted Decision Trees) trained for the optimal separation of electrons, muons, pions and kaons in the momentum range from 100 to 1200 MeV/c. The input variables for the classifiers are energy depositions of charged particles in 12 layers of the liquid xenon calorimeter of the CMD-3. Various issues of the detector response tuning in simulation and calibration of calorimeter strip channels will be considered.

(Based on the materials of the candidate dissertation.)