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

2024/07/21 by SND Collaboration, Achasov, M. N., Barnyakov, A. Yu. +34
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.2407.15140

Abstract

The cross section for the e⁺e^-→ 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→ 2π⁰ 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_SK_L)B(ϕ→ e⁺e^-) are determined from the fit to the cross-section energy dependence.

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