Study of K(S) K(L) coupled decays and K(L) Be interactions with the CMD-2 detector at VEPP-2M Collider

The integrated luminosity about 4000 inverse nanobarn of around phi meson mass ( 5 millions of phi mesons) has been collected with the CMD-2 detector at the VEPP-2M collider. A latest analysis of the KS KL coupled decays based on 30 % of available data is presented in this paper. The KS KL pairs from phi meson 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 to the CP violating KL into pi+ pi- decay was performed. CP violating decays were not identified because of the domination 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 mesons was found to be 53 +- 17 mb in agreement with theoretical expectations. The angular distribution of KS mesons after regeneration and the total cross section of KL for Be have been measured.

Note:

14 pages, 8 figures

electron positron: colliding beams
electron positron: annihilation
Phi(1020): electroproduction
Phi(1020): hadronic decay
K0(L): hadronic decay
K0(S): hadronic decay
K0(S): regeneration
K0 nucleus: interaction
beryllium
total cross section

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