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OKA ([ОКА — Опыты с КАонами, in liberal translation "Observations of KAons"] Error: {{Langx}}: text has italic markup (help)) 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^[1]. 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 ass GAMS-2000 detector, the total absorption hadron calorimeter and the muon counters^[2].

The research program of the experiment has the following items^[3]:

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

^ CERN Courier article
^ Kurshetsov (2009). "Status of "OKA" experiment". Proceedings of 2009 KAON International Conference: 3–4.
^ Obraztsov; Landsberg (2001). "Prospects for CP-violation searches in the future experiment with RF separated K^± beam at U-70". Nucl.Phys.Proc.Suppl. 99B: 3. arXiv:hep-ex/0011033. doi:10.1016/S0920-5632(01)01385-8.

[1] CERN Courier article

[Kurshetsov09-2] Kurshetsov (2009). "Status of "OKA" experiment". Proceedings of 2009 KAON International Conference: 3–4.

[ObraLands2000-3] Obraztsov; Landsberg (2001). "Prospects for CP-violation searches in the future experiment with RF separated K^± beam at U-70". Nucl.Phys.Proc.Suppl. 99B: 3. arXiv:hep-ex/0011033. doi:10.1016/S0920-5632(01)01385-8.

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