arXiv subjects

E. V. Kardapoltsev

Publications and source records attributed to E. V. Kardapoltsev.

2 recordsLinked to original sources

arXiv2024

Measurement of the $e^+e^-\to K_SK_L$ cross section near the $ϕ(1020)$ resonance with the SND detector

The cross section for the $e^+e^-\to K_SK_L$ process is measured in the center-of-mass energy range from 1000 MeV to 1100 MeV in the experiment with the SND detector at the VEPP-2000 $e^+e^-$ collider. The measurement is carried out in the $K_S\to 2π^0$ decay mode. Data with an integrated luminosity of 20 pb$^{-1}$ recorded in 2018 at 18 energy points are used in the analysis. The systematic uncertainty in the measured cross section at the maximum of the $ϕ$ resonance is 0.9%. The mass, width of the $ϕ$ meson, and the product of the branching fractions $B(ϕ\to K_SK_L)B(ϕ\to e^+e^-)$ are determined from the fit to the cross-section energy dependence.

hep-ex↗

arXiv2023

Measurement of the neutron timelike electromagnetic form factor with the SND detector

The results of the measurement of the $e^+e^- \to n \bar{n}$ cross section and effective neutron timelike form factor are presented. The data taking was carried out in 2020-2021 at the VEPP-2000 $e^+e^-$ collider in the center-of-mass energy range from 1891 to 2007 MeV. The general purpose nonmagnetic detector SND is used to detect neutron-antineutron events. The event selection is performed using the time-of-flight technique. The measured cross section is 0.4-0.6 nb. The neutron form factor in the energy range under study varies from 0.3 to 0.2.

hep-ex↗