Measurement of the $e^+e^-\to K_SK_L$ cross section near the $φ(1020)$ resonance with the SND detector
hep-ex
/ Authors
SND Collaboration, M. N. Achasov, A. Yu. Barnyakov, E. V. Bedarev, K. I. Beloborodov, A. V. Berdyugin, A. G. Bogdanchikov, A. A. Botov, D. E. Chistyakov, T. V. Dimova
and 27 more authors
V. P. Druzhinin, E. V. Kardapoltsev, A. S. Kasaev, A. A. Kattsin, A. G. Kharlamov, I. A. Koop, A. A. Korol, D. P. Kovrizhin, A. S. Kupich, A. P. Kryukov, N. A. Melnikova, N. Yu. Muchnoi, A. E. Obrazovsky, E. V. Pakhtusova, K. V. Pugachev, S. A. Rastigeev, Yu. A. Rogovsky, A. I. Senchenko, S. I. Serednyakov, Yu. M. Shatunov, S. P. Sherstyuk, D. A. Shtol,
/ Abstract
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.