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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

Akhmetshin R. R., Aksenov G. A., Anashkin E. V., Aulchenko V. M., Baibusinov B. O., Banzarov V. S., Barkov L. M., Baru S. E., Bondar A. E., Chernyak D. V., Danilov V., Eidelman S. I., Fedotovich G. V., Gabyshev N. I., Grebeniuk A. A., Grigoriev D. N., Ivanov P. M., Khazin B. I., Koop I. A., Kuzmin A. S., Logashenko I. B., Lukin P. A., Lysenko A. P., Maksimov A. V., Merzlyakov Yu I., Nesterenko I. N., Okhapkin V. S., Perevedentsev E. A., Polunin A. A., Popkov E. V., Ptitzyn V. I., Purlats T. A., Redin S. I., Root N. I., Ruban A. A., Ryskulov N. M., Shatunov Yu M., Sher A. E., Shubin M. A., Shwartz B. A., Sidorov V. A., Skrinsky A. N., Smakhtin V. P., Snopkov I. G., Solodov E. P., Sukhanov A. I., Titov V. M., Yudin Yu V., Zavarzin V. G., Brown D. H., Miller J. P., Roberts B. L., Worstell W. A., Thompson J. A., Valine C. M., Cushman P. B., Dhawan S. K., Hughes V. W.

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.