OKA ([ОКА — Опыты с КАонами, in liberal translation "Observations of KAons"] Error: {{Lang-xx}}: 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
edit- ^ 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.