Measurement of the Kaonic Hydrogen X-Ray Spectrum

G. Beer, A. M. Bragadireanu, M. Cargnelli, C. Curceanu-Petrascu, J.-P. Egger, H. Fuhrmann, C. Guaraldo, M. Iliescu, T. Ishiwatari, K. Itahashi, M. Iwasaki, P. Kienle, T. Koike, B. Lauss, V. Lucherini, L. Ludhova, J. Marton, F. Mulhauser, T. Ponta, L. A. Schaller, R. Seki, D. L. Sirghi, F. Sirghi, and J. Zmeskal (DEAR Collaboration)
Phys. Rev. Lett. 94, 212302 – Published 2 June 2005

Abstract

The DEAR (DAΦNE exotic atom research) experiment measured the energy of x rays emitted in the transitions to the ground state of kaonic hydrogen. The measured values for the shift ϵ and the width Γ of the 1s state due to the Kp strong interaction are ϵ1s=193±37 (stat) ±6 (syst) eV and Γ1s=249±111 (stat) ±30 (syst) eV, the most precise values yet obtained. The pattern of the kaonic hydrogen K-series lines, Kα, Kβ, and Kγ, was disentangled for the first time.

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  • Received 21 September 2004

DOI:https://doi.org/10.1103/PhysRevLett.94.212302

©2005 American Physical Society

Authors & Affiliations

G. Beer1, A. M. Bragadireanu2,3, M. Cargnelli4, C. Curceanu-Petrascu2, J.-P. Egger5, H. Fuhrmann4, C. Guaraldo2, M. Iliescu2,3, T. Ishiwatari4, K. Itahashi6, M. Iwasaki6, P. Kienle4,7, T. Koike6, B. Lauss8, V. Lucherini2, L. Ludhova9, J. Marton4, F. Mulhauser9, T. Ponta3, L. A. Schaller9, R. Seki10,11, D. L. Sirghi2,3, F. Sirghi2, and J. Zmeskal4 (DEAR Collaboration)

  • 1Department of Physics and Astronomy, University of Victoria, P. O. Box 3055, Victoria, British Columbia V8W 3P6, Canada
  • 2Laboratori Nazionali di Frascati, INFN, C. P. 13, Via E. Fermi 40, I-00044 Frascati, Italy
  • 3Institute of Physics and Nuclear Engineering “Horia Hulubei”, Particle Physics Department, IFIN-HH, P.O. Box MG-6, R-76900 Magurele, Bucharest, Romania
  • 4Stefan Meyer Institut für subatomare Physik, Austrian Academy of Sciences, Boltzmanngasse 3, A-1090 Vienna, Austria
  • 5Institut de Physique, Université de Neuchâtel, 1 rue A. -L. Breguet, CH-2000 Neuchâtel, Switzerland
  • 6Institute of Physical and Chemical Research (RIKEN), Wako-shi, Saitama, 351-0198, Japan
  • 7Technical University, Munich, 80290 Germany
  • 8Department of Physics, University of California, 366 LeConte Hall, Berkeley, California 94720, USA
  • 9Institut de Physique, Université de Fribourg, CH-1700 Fribourg, Switzerland
  • 10Department of Physics and Astrophysics, California State University, Northridge, California 91330, USA
  • 11W.E. Kellogg Radiation Laboratory, California Institute of Technology, Pasadena, California 91125, USA

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Issue

Vol. 94, Iss. 21 — 3 June 2005

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