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First results on kaonic hydrogen from the DEAR experiment

  • Cold and hot nuclear matter
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Abstract.

The objective of DEAR (DAΦNE Exotic Atom Research) is the measurement of the K α line shift and width, due to the strong interaction, in kaonic hydrogen and a similar measurement - the first one - in kaonic deuterium. The aim is a precision determination of the antikaon-nucleon isospin dependent scattering lengths in order to obtain the kaon nucleon sigma terms. In a first phase, dedicated to the calibration and optimization of the setup, the experiment collected data on kaonic nitrogen: for the first time a complex of three transitions (7 → 6 at 4.6 keV, 6 → 5 at 7.6 keV and 5 → 4 at 14 keV) was measured, and the corresponding yields obtained. The kaonic hydrogen measurement was performed for a total integrated luminosity of about 60 pb-1 in the last months of the 2002 year. Data analyses are in progress, preliminary results being hereby presented, together with those on kaonic nitrogen.

PACS: 36.10.-K – 36.10.Gv

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Authors and Affiliations

  1. INFN-Laboratori Nazionali di Frascati, C.P. 13, Via E. Fermi 40, I-00044 Frascati, Italy

    C. Guaraldo, A.M. Bragadireanu, C. Curceanu (Petrascu), M. Iliescu, V. Lucherini, T. Ponta, D. Sirghi & F. Sirghi

  2. Universite de Fribourg, Institut de Physique, Bd. de Perolles, CH-1700 Fribourg, Switzerland

    J.-P. Egger, L. Ludhova, F. Mulhauser & L.A. Schaller

  3. Universite de Neuchatel, Institut de Physique, 1 rue A.-L. Breguet, CH-2000 Neuchatel, Switzerland

    J.-P. Egger

  4. Institute for Medium Energy Physics, Boltzmanngasse 3, A-1090 Vienna, Austria

    M. Cargnelli, H. Fuhrman, T. Ishiwatari, J. Marton & J. Zmeskal

  5. Institute of Physics and Nuclear Engineering “Horia Hulubei”, P.O. Box MG - 6, R-76900, Bucharest, Romania

    A.M. Bragadireanu, C. Curceanu (Petrascu), M. Iliescu, T. Ponta & D. Sirghi

  6. Institute of Physical and Chemical Research (RIKEN), 2-1 Hirosawa, Wako, Saitama 351-01, Japan

    M. Iwasaki & P. Strasser

  7. Tokyo Institute of Technology, 2-12-1 Ookoyana Meguro, Tokyo 152, Japan

    K. Itahashi

  8. Physics Department, University of California and Berkeley, Berkeley CA 94720, USA

    B. Lauss

  9. University of Victoria, Department of Physics and Astronomy, P.O. Box 3055 Victoria, BC, Canada V8W3P6

    G. Beer

  10. W.E. Kellogg Radiation Laboratory, California Institute of Technology, Pasadena, CA 91125, USA

    R. Seki

  11. Department of Physics and Astrophysics, California State University, Northridge, CA 91330, USA

    R. Seki

Authors
  1. C. Guaraldo
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  2. G. Beer
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  3. A.M. Bragadireanu
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  4. M. Cargnelli
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  5. C. Curceanu (Petrascu)
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  6. J.-P. Egger
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  7. H. Fuhrman
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  8. M. Iliescu
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  9. T. Ishiwatari
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  10. K. Itahashi
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  11. M. Iwasaki
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  12. B. Lauss
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  13. V. Lucherini
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  14. L. Ludhova
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  15. J. Marton
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  16. F. Mulhauser
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  17. T. Ponta
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  18. L.A. Schaller
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  19. R. Seki
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  20. D. Sirghi
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  21. F. Sirghi
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  22. P. Strasser
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  23. J. Zmeskal
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Guaraldo, C., Beer, G., Bragadireanu, A. et al. First results on kaonic hydrogen from the DEAR experiment. Eur. Phys. J. A 19 (Suppl 1), 185–188 (2004). https://doi.org/10.1140/epjad/s2004-03-031-y

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  • DOI: https://doi.org/10.1140/epjad/s2004-03-031-y

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