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OKA ((ロシア語:''ОКА'' — ''Опыты с КАонами'', in liberal translation "Observations of KAons")) is a particle physics detector experiment at the U-70 accelerator in the Institute for High Energy Physics located in Protvino near Moscow (Russia). OKA is specialized experiment with separated charge kaons beam. Superconducting high radio-frequency separator produces a beam of charged kaons intensity (4 ÷ 6) · 106 ''K'' for a cycle with momenta 12.5 and 18 GeV.〔(CERN Courier article )〕 Experimental complex includes the decay volume with veto system, the wide-aperture magnetic spectrometer consists of a set of proportional chambers, straw tubes, drift tubes and hodoscope, the Cherenkov counters for charged particle identification, the electromagnetic calorimeter known as GAMS-2000 detector, the total absorption hadron calorimeter and the muon counters.〔 〕 The research program of the experiment has the following items:〔 〕 * Search for new physics beyond the Standard Model - the new (pseudo)scalar and tensor interactions in the weak leptonic and semi-leptonic decays of ''K''-mesons and other deviations from the ''V – A'' theory. * Search the effects of direct CP-violation in the decays of ''K''±-mesons. * The study of hadron interactions – chiral perturbation theory, lattice QCD, dispersion sum rules and so on. * Hadron spectroscopy. * Coulomb processes in kaon-nucleon and pion-nucleon interactions. The sensitivity of the OKA experiment will enable to observe decays with branching fractions of about 10−8. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「OKA (experiment)」の詳細全文を読む スポンサード リンク
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