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The AMADEUS project – precision studies of the low-energy antikaon nucleon interaction

The AMADEUS project – precision studies of the low-energy antikaon nucleon interaction Johann Zmeskal , SMI – Vienna, Austria for the AMADEUS collaboration. International Workshop on Hadronic Atoms and Kaonic Nuclei ECT*, Trento 12 – 16 October 2009. AMADEUS at DA  NE. A ntikaon

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The AMADEUS project – precision studies of the low-energy antikaon nucleon interaction

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  1. The AMADEUS project – precision studies of the low-energy antikaon nucleon interaction Johann Zmeskal, SMI – Vienna, Austria for the AMADEUS collaboration International Workshop on Hadronic Atoms and Kaonic Nuclei ECT*, Trento 12 – 16 October 2009

  2. AMADEUS at DANE Antikaon Matter At DANE: Experimentswith Unraveling Spectroscopy International Workshop on Hadronic Atoms and Kaonic Nuclei

  3. AMADEUS collaboration 110 scientists from 34 Institutes of 14 Countries Letter of Indent Study of deeply bound kaonic nuclear states at DANE2 March 2006 International Workshop on Hadronic Atoms and Kaonic Nuclei

  4. Introduction • Investigations of antikaon-mediated bound nuclear • systems were done, are ongoing or planned at several • facilities - KEK, LNF, GSI, J-PARC, CERN-AD • Next-generation experiments should be exclusive, • i.e. require the measurement of formation and decay • AMADEUS @ DAΦNE2 aims to do that with • - stopped K− in low-density gas targets • - unique features available at DAΦNE2 • - measurement of all decay particles, charged and • neutral, using the KLOE detector International Workshop on Hadronic Atoms and Kaonic Nuclei

  5. DAFN at LNF International Workshop on Hadronic Atoms and Kaonic Nuclei

  6. The goal of AMADEUS AMADEUS’s main aim is to perform a full acceptance, high precision measurement of antikaon-mediated bound nuclear systems – studying the formation as well as the decay process, by implementing the KLOE detector with an inner AMADEUS dedicated setup, containing a cryogenic target and a trigger system (and an inner tracker in a second phase). First actions: Results of the KLOE data analysis were presented by  O. Vazquez Test measurements of the AMADEUS trigger system were presented by  A. Scordo International Workshop on Hadronic Atoms and Kaonic Nuclei

  7. The experimental program - 1 study of the (most) fundamental antikaon-mediated bound nuclear systems, the kaonicdibaryon states: ppK- and (pnK-) produced in a 3He gas target, by their formation and decay processes and as next step, the kaonic tri-baryon states: ppnK- and (pnnK-) produced in a 4He gas target, by their formation and decay processes International Workshop on Hadronic Atoms and Kaonic Nuclei

  8. The experimental program - 2 • Low-energy charged kaon cross section on p, d, He-3 and He-4, for K- momentum lower than 100 MeV/c • The K- nuclear interactions in Helium (poorly known – based on one paper from 1970 …) • Properties of L and charged S´s • Resonance states as L(1405) or the S(1385) • in addition their behaviour in a nuclear medium • can be studied International Workshop on Hadronic Atoms and Kaonic Nuclei

  9. Production methods of antikaon-mediated bound nuclear cluster • stopped K- reactions on light nuclei • in-flight K- reactions • protons on proton (or light nuclei) • heavy ion collisions • strangeness production in antiproton annihilation International Workshop on Hadronic Atoms and Kaonic Nuclei

  10. tri-baryon systems with S = -1 • formation process: • K- + 4He  ppnK- + n • possible decay channels: • ppnK-   + d •   + p + n •   - + p + p •   0 + d •   0 + p + n •  p + - • n + 0 • -  n + - • 0   +  International Workshop on Hadronic Atoms and Kaonic Nuclei

  11. Hyperon production K-N Y International Workshop on Hadronic Atoms and Kaonic Nuclei

  12. Non-mesonic absorption K-NN YN International Workshop on Hadronic Atoms and Kaonic Nuclei

  13. Amadeus @ KLOE Schematic sideviewof the KLOE detector withAMADEUS componentsadded: K- e- e+ K+ International Workshop on Hadronic Atoms and Kaonic Nuclei

  14. KLOE CDC Lambda invariant mass, using existing KLOE data (O. Vazquez Doce)  = 0.289 ± 0.003 Minv= 1115,723 ±0. 003stat (MeV/c2) systematic dependents on momentum calibration, has to be evaluated using 2-body decays: K±→μ±ν and K±→π±π0 PDG: MΛ= 1115,683 ±0.006stat±0.006syst (MeV/c2) International Workshop on Hadronic Atoms and Kaonic Nuclei

  15. KLOE calorimeter International Workshop on Hadronic Atoms and Kaonic Nuclei

  16. Reconstructed Ks mass Ksoo, with o Photon energy resolution (E)/E = 5.7%xE(GeV)-1/2 time resolution t/t = 54 [ps]xE(GeV)-1/2 International Workshop on Hadronic Atoms and Kaonic Nuclei

  17. Neutron detection efficiency MC simulation, confirmed with measurements at TSL (Uppsala Threshold at 1 MeV Threshold at 3 MeV International Workshop on Hadronic Atoms and Kaonic Nuclei

  18. AMADEUS @ KLOE International Workshop on Hadronic Atoms and Kaonic Nuclei

  19. AMADEUS @ KLOE International Workshop on Hadronic Atoms and Kaonic Nuclei

  20. AMADEUS setup half-toroidal cryogenic target cell 1st inner-layer of scintillating fibre fiber size: 1x1mm2 three outer-layers of scintillating fibre fiber size: 1x1mm2 2nd inner-layer of scintillating fibre fiber size: 1x1mm2 Low-mass cryogenic gas target cell: T = 10 K P = 1.0 bar Rin = 5 cm Rout = 15 cm L = 20 cm International Workshop on Hadronic Atoms and Kaonic Nuclei

  21. The AMADEUS trigger system  A. Scordo • Cilindrical layer of scintillating fibers surrounding the beam pipe to trigger K+ K- in opposite directions • Readout to be done by SiPM • Inner tracker(eventually, a first tracking stage before the DC) • Target( A gaseous He target for a first phase of study) • Trigger (1 or 2 layers of ScFi surrounding the interaction point) target K- K+ Trigger system ScFi + SiPM readout International Workshop on Hadronic Atoms and Kaonic Nuclei

  22. Sketch of the AMADEUS setup International Workshop on Hadronic Atoms and Kaonic Nuclei

  23. View in beam direction Cryo target cell Kaon trigger • Beam pipe: • = 60 mm, • thickness = 0.25 mm • made of BeAl alloy International Workshop on Hadronic Atoms and Kaonic Nuclei

  24. AMADEUS setup II vacuum chamber kaon trigger: 2 inner-layer of scintillating fibre fiber size: 1x1mm2 full toroidalcryogenic target cell thin-walled beam pipe 2 outer-layer of scintillating fibre fiber size: 1x1mm2 International Workshop on Hadronic Atoms and Kaonic Nuclei

  25. AMADEUS setup – phase II Tracking device: TPC-GEM or 3-4 C-GEMs Kaon trigger: Scint. fibers with SiPMs Target system: cylindrical cryogenic cell in vacuum chamber 25

  26. AMADEUS setup – phase II FEE Cylindrical GEMs inner tracker International Workshop on Hadronic Atoms and Kaonic Nuclei

  27. Beam-pipe solutions International Workshop on Hadronic Atoms and Kaonic Nuclei

  28. Number of charged kaon pairs Total number of produced charged Kaon pairs for L = 2 fb-1 0.49 branchingratiofor K± 3 ×10-30 cm2Fproductioncrosssection 2 fb-1 = 2 × 1039 cm-2integratedluminosity N = Ls b = 2.9 × 109 K- 1 barn = 10-24 cm2 1 femtobarn = 10-15barn = 10-39 cm2 International Workshop on Hadronic Atoms and Kaonic Nuclei

  29. Number of events for the channel: K- +4He (K-ppn) + n with (K-ppn) +d • Assumptions: 20% stopped kaons • Y = 5.10-4 (K-ppn) formation • BR for decay channel = 10% (with   p + -) • For an integrated luminosity of 2 fb-1: • N = 3x109 x 0.2 (stops) x 5x10-4 (Y) x 0.1 (BR) = 30 000 ev • Detection efficiency for charged particles (40%)  12 000 ev • Detection efficiency for neutrons (30%)  3 600 ev • for which both missing and invariant mass can be reconstructed International Workshop on Hadronic Atoms and Kaonic Nuclei

  30. Beam time request • 2 fb-1ofintegratedluminositywithHe4 target in ordertostudy the tribaryon (S=-1) • 2 fb-1ofintegratedluminositywithHe3 target in ordertostudy the dibaryon (S=-1) overallintegratedluminosityof 4 fb-1 With the luminosity upgrade of DANE, the machineshoulddeliver at least500pb-1/month, whichmeansthat the overall AMADEUS Phase-1 programcouldbecompleted in about8 months International Workshop on Hadronic Atoms and Kaonic Nuclei

  31. AMADEUS time schedule • AMADEUS R&D, construction and tests • the R&D for AMADEUS are ongoing, • construction, assembly and tests have • to be finished 2010/11 • roll-in of AMADEUS • roll-in 2011/12 (end of KLOE step 0) • AMADEUS data taking • for an integrated luminosity of about 4 fb-1 International Workshop on Hadronic Atoms and Kaonic Nuclei

  32. Conclusion The goal of AMADEUS is to perform a complete measurement - formation and decay processes - of di - and tri-baryon antikaon-mediated bound nuclear systems in helium-3 and helium-4. It will contribute to a definite answer of the existence of antikaon-mediated bound nuclear systems in light systems. The antikaon – nucleon/nucleus interaction will be studied in detail with AMADEUS. International Workshop on Hadronic Atoms and Kaonic Nuclei

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