Measurement of the e + e − → K S K L cross section near the ϕ ( 1020 ) resonance with the SND detector

The cross section for the e + e − → K S K L process is measured in the center-of-mass energy range from 1000 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 → 2 π 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 → K S K L ) B ( ϕ → e + e − ) are determined from the fit to the cross section energy dependence.