ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 1997, vol. 398, p. 423-431
Study of KSKL coupled decays and KL-Be interactions with the CMD-2 detector at VEPP-2M collider
An integrated luminosity ≈ 4000 nb-1 of around θ meson mass (5.0 × 106 of θ's) has been collected with the CMD-2 detector at the VEPP-2M collider. The latest analysis of the KSKL coupled decays based on 30% of available data is presented in this paper. The KSKL pairs from θ decays were reconstructed in the drift chamber when both kaons decayed into two charged particles. From a sample of 1423 coupled decays a selection of candidates for the CP-violating KL -> → π+π- decay was performed. CP-violating decays were not identified because of the dominance of events with a KL regenerating at the Be beam pipe into Ks and a background from KL semileptonic decays. The regeneration cross section of 110 MeV/c KL's was found to be σBe reg = 53 ± 17 mb, in agreement with theoretical expectations. The angular distribution of Ks's after regeneration and the total cross section of KL for Be have been measured. © 1997 Published by Elsevier Science B.V.