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EXOTIC ATOM RESEARCH AT DA Φ NE

EXOTIC ATOM RESEARCH AT DA Φ NE. J. Marton Institute for Medium Energy Physics Austrian Academy of Sciences. D AFNE E XOTIC A TOM R ESEARCH. Exotic Atom Research by IMEP. Main field: Hadron physics – hadronic atoms Kaonic atoms K - p, K - d @ LNF / INFN.

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EXOTIC ATOM RESEARCH AT DA Φ NE

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  1. EXOTIC ATOM RESEARCHAT DAΦNE J. Marton Institute for Medium Energy Physics Austrian Academy of Sciences DAFNE EXOTIC ATOM RESEARCH RECFA Meeting, Innsbruck, March 26, 2004

  2. Exotic Atom Research by IMEP Main field: Hadron physics – hadronic atoms Kaonic atoms K-p, K-d @ LNF / INFN • Contributions of IMEP to other topics in exotic atom research • Search for nuclear clusters bound by K- (GSI, J-PARC) • Antiprotonic atoms (CERN, FLAIR/GSI-future) • Pionic atoms πH (PSI) • Theoretical studies (collaboration with TU Vienna) RECFA Meeting, Innsbruck, March 26, 2004

  3. IMEP: Member of DEAR / SIDDHARTA • G. Beer1, A.M. Bragadireanu2, M. Cargnelli3, C. Curceanu(Petrascu)4,2, J.P. Egger5, H. Fuhrmann3, C. Guaraldo4 (spokesperson), M. Iliescu4,2, T. Ishiwatari3, K. Itahashi6, M. Iwasaki6, P. Kienle3, B. Lauss7, V. Lucherini4, L. Ludhova8, J. Marton3, F. Mulhauser8, T. Ponta2,4, L.A. Schaller8, R. Seki9,10, D. Sirghi4, F. Sirghi4, P. Strasser6 and J. Zmeskal3 • 1Univ. of Victoria; 2Inst. of Physics and Nuclear Engineering “Horia Hulubei”;3Institute for Medium Energy Physics; 4INFN Laboratori Nazionali di Frascati;5Université de Neuchâtel; 6RIKEN; 7University of California; 8Université de Fribourg; 9California Institute of Technology; 10California State University SIDDHARTA Silicon Drift Detectors for Hadronic Atom Research by Timing Applications I3 Hadron Physics in FP6/EC – Joint Research Activity SIDDHARTA in cooperation with LNF, MPG, PNSensor, Politecnico Milan, IFIN-HH. RECFA Meeting, Innsbruck, March 26, 2004

  4. Motivation X-ray transitions in kaonic atoms – precision spectroscopy Kaonic hydrogen isotopes: low energy QCD studies Simplest exotic atoms with strangeness • hadronic shift ε1s and width Γ1s • directly observable by X-ray spectroscopy • kaonic hydrogen „puzzle“ solved – but: precision data missing • kaonic deuteriumnever measured before  Information on (1405) sub-threshold resonance important for research on deeply bound kaonic states  Determination of the isospin dependent KN scattering lengths  Testing chiral symmetry breaking in systems with strangeness RECFA Meeting, Innsbruck, March 26, 2004

  5. Our goals Measurement of the hadronic shift and width of hydrogen at the percent level First measurement of kaonic deuterium Extraction of the isospin-dependent scattering lengths with kaonic hydrogen and kaonic deuterium data SIDDHARTA Silicon Drift Detectors for Hadronic Atom Research by Timing Applications RECFA Meeting, Innsbruck, March 26, 2004

  6. DAΦNE @ LNF Electron – Positron collider with collision energy tuned to the Φ meson resonance at 1.02 GeV c.m. • Monoenergetic kaons from Φ meson decay Φ K+ K- (branching ~ 50%) • Ideal kaon trigger • Pion background very small • Kaon production ~ 3×106 K- per day •  Ideal facility • for exotic (kaonic) atom research DEAR RECFA Meeting, Innsbruck, March 26, 2004

  7. DEAR Experimental Set-up X-ray spectroscopy by CCD array (16 CCD-55) RECFA Meeting, Innsbruck, March 26, 2004

  8. Experiment @ DAPHNE / LNF RECFA Meeting, Innsbruck, March 26, 2004

  9. Results on Kaonic Nitrogen Thesis T. Ishiwatari (IMEP), to be published in Phys. Lett. B • 3 X-ray transitions first measured • Extraction of the transition yields • Impact on cascade calculations • Kaonic nitrogen nearly fully stripped of electrons: high precision measurement of the charged kaon mass RECFA Meeting, Innsbruck, March 26, 2004

  10. Results on Kaonic Hydrogen 2 independent data analyses by LNF and IMEP  consistent results Analysis by M. Cargnelli (IMEP) • repulsive shift verified • smaller shift, width • smaller error bars • Kb, Kg disentangled Combined result for hadronic shift and width (preliminary) Shift: 1s = - 194 ± 46 eV Width: 1s = 249 ± 132 eV RECFA Meeting, Innsbruck, March 26, 2004

  11. DEAR Results (preliminary) 1000 800 DEAR prelim. 600 Izycki et al, 1980 400 200 Bird et al, 1983 Davies et al, 1979 0 -500 0 500 shifte1s[eV] attractive repulsive KpX (KEK) M. Iwasaki et al, 1997 KpX widthG1s[eV] • = - 323 ± 63 ± 11 eV G = 407 ± 208 ± 100 eV New theoretical studies: Ivanov et al. 2003 / 2004 Meißner, Raha, Rusetsky 2004 RECFA Meeting, Innsbruck, March 26, 2004

  12. New X-ray detectors providing timing capability background suppression by using the kaon-X ray time correlation excellent energy resolution high efficiency, large solid angle dedicated compact geometry Best choice: SDD (silicon drift detectors)  R&D within SIDDHARTA Next Steps SIDDHARTA Silicon Drift Detectors for Hadronic Atom Research by Timing Applications In the next stage of the experiment we expect a substantial improvement in signal-to-noise ratio by more than 2 orders of magnitude RECFA Meeting, Innsbruck, March 26, 2004

  13. Next Steps cont‘d SDDs New design for target-detector system with high efficiency Example: Toroidal Setup with SDDs (work in progress) Large area SDDs (1cm2 each, total area ~ 200 cm2) e+ e- Cryogenic gas target volume Structure material carefully selected (PIXE@VERA - Vienna) RECFA Meeting, Innsbruck, March 26, 2004

  14. Summary Preliminary results on hadronic shift and width in kaonic hydrogen: repulsive hadronic shift in K-p verified. smaller values and better precision for shift and width. Kβ, Kγ resolved for the first time. • DEAR one of the first experiments at DAPHNE • First production of exotic atoms at DAFNE • Measurements on kaonic nitrogen and finally kaonic hydrogen • Potential of the methodusing SDDs demonstrated by test measurements •  future high precision measurements on kaonic atoms are feasible SIDDHARTA Silicon Drift Detectors for Hadronic Atom Research by Timing Applications RECFA Meeting, Innsbruck, March 26, 2004

  15. Outlook SDDs with trigger capability (SIDDHARTA project) New target-detector set-up in progress Next experiments planned Precison measurement of kaonic hydrogen. Measurement of kaonic deuterium (first ever) Long range perspectives:kaonic helium Precision measurement of kaon mass RECFA Meeting, Innsbruck, March 26, 2004

  16. Post Scriptum "The most important experiment to be carried out in low energy K-meson physics today is the definitive determination of the energy level shifts in K-p and K-d atoms, because of their direct connection with the physics of the KN interaction and their complete independence of all other kind of measurements which bear on this interaction“ R.H. Dalitz RECFA Meeting, Innsbruck, March 26, 2004

  17. The End RECFA Meeting, Innsbruck, March 26, 2004

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