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OKA Experiment for Studying Rare Kaon Decays

OKA Experiment for Studying Rare Kaon Decays. Status and Prospects. Viacheslav Duk , INR Moscow for collaboration. IHEP, Protvino. OKA collaboration: IHEP, Protvino INR, Moscow JINR, Dubna. Experiments with charged kaons Separated kaon beam at IHEP OKA physics program

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OKA Experiment for Studying Rare Kaon Decays

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  1. OKA Experiment for Studying Rare Kaon Decays Status and Prospects ViacheslavDuk, INR Moscow for collaboration V.Duk, INR Moscow Quarks-2008, May 23-29

  2. IHEP, Protvino OKA collaboration: IHEP, Protvino INR, Moscow JINR, Dubna V.Duk, INR Moscow Quarks-2008, May 23-29

  3. Experiments with charged kaons Separated kaon beam at IHEP OKA physics program Current status of the experiment Conclusions Contents V.Duk, INR Moscow Quarks-2008, May 23-29

  4. Current and future experiments with kaons In-flight decays Stopped kaons NA62 – CERN, K+ (talk by Augusto Ceccucci) OKA - IHEP, Protvino, K± (this talk) E14(KOTO) – J-PARC, K0 (talk by Mikhail Doroshenko) E06 – J-PARC,K+→μνπ0 E09 – J-PARC, K+ →π+νν V.Duk, INR Moscow Quarks-2008, May 23-29

  5. Experiments with charged kaons 2 strategies in kaon experiments Studying more rare decays Inreasing presicion High intensity beams Separated (“Clean”) beams how OKA NA62 experiment Strategies are complementary V.Duk, INR Moscow Quarks-2008, May 23-29

  6. Separated beams – + • Low background from inelastic scattering • Absence of trigger effects • Possibility of fixed target program • Complicated channel • Relatively low intensity V.Duk, INR Moscow Quarks-2008, May 23-29

  7. separated and unseparated beams:complementarity V.Duk, INR Moscow Quarks-2008, May 23-29

  8. RF separated beam at IHEP Panofsky scheme • Deflectors: largest possible distance • Synchronized em field (3GHz) in deflectors • (-1) optics: pions are deflected in opposite directions • Beam stopper: absorbe pions • Choose momentum: maximal deflection of kaons • Protons also absorbed • (mp)2 /(mπ)2 ~ 4 kaon deflection proton deflection Nd deflectors are cooled by liquid He, T=1.8K V.Duk, INR Moscow Quarks-2008, May 23-29

  9. Physics program at OKA Baseline: ISTRA+ program on a larger statistics The program is being tuned by latest results from NA48/2, NA62, KLOE ISTRA+: 3%(kaons)*2*106=6*104 OKA: 70%(kaons)*5*106=350*104 OKA / ISTRA+ ~60 V.Duk, INR Moscow Quarks-2008, May 23-29

  10. Physics: ChPT tests, deviations from SM K→μνπ0 (Kμ3) and K→eνπ0 (Ke3) decays Search for tensor and scalar terms aa Formafactors in Ke3, Kμ3, Fv and FA in K→μνγ, K→eνγ ISTRA+: ~500K Kμ3 OKA: ~20M Kμ3 V.Duk, INR Moscow Quarks-2008, May 23-29

  11. Physics: T-odd effects V.Duk, INR Moscow Quarks-2008, May 23-29

  12. Status of the experiment V.Duk, INR Moscow Quarks-2008, May 23-29

  13. Status of the experiment V.Duk, INR Moscow Quarks-2008, May 23-29

  14. Status of the experiment: separated beam Beamline with RF deflector RF deflector V.Duk, INR Moscow Quarks-2008, May 23-29

  15. Status of the experiment: separated beam Kaons in the beam 1% No separator with separator 7% • Separator status: • commissioned • Worked during 2007 test run • Cleaning in progress V.Duk, INR Moscow Quarks-2008, May 23-29

  16. OKA status: beam spectrometer Beam profile • Beam proportional chambers: • 1mm step • 20cm X 20cm • Threshold Cherenkov counters • Beam magnet efficiency σP/P ~ 1% V.Duk, INR Moscow Quarks-2008, May 23-29

  17. OKA status: active decay volume • 11m long • Filled with He • sandwich veto counters with fiber readout (~300 channels) V.Duk, INR Moscow Quarks-2008, May 23-29

  18. OKA status: spectrometer Straw tubes: 9mm tubes 2 layers 140cm x 140cm Drift tubes: 4cm tubes 3 layers 200cm x 200cm V.Duk, INR Moscow Quarks-2008, May 23-29

  19. OKA status: electromagnetic calorimeter • 3.8cm x 3.8cm cells • Resolution 5%/√E • ~20 X0 • ~4000 channels V.Duk, INR Moscow Quarks-2008, May 23-29

  20. RF separated high energy kaon beam at IHEP, Protvino has been constructed and is being commissioned First stage of OKA setup has been commissioned First statistics – November 2008 Conclusions V.Duk, INR Moscow Quarks-2008, May 23-29

  21. Thank you! V.Duk, INR Moscow Quarks-2008, May 23-29

  22. Spares: separator V.Duk, INR Moscow Quarks-2008, May 23-29

  23. Status of the experiment V.Duk, INR Moscow Quarks-2008, May 23-29

  24. Status of the experiment V.Duk, INR Moscow Quarks-2008, May 23-29

  25. Status of the experiment V.Duk, INR Moscow Quarks-2008, May 23-29

  26. K→ V.Duk, INR Moscow Quarks-2008, May 23-29

  27. K→ V.Duk, INR Moscow Quarks-2008, May 23-29

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