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The Pionic Hydrogen Experiment at PSI |
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| Authors: | D. F. Anagnostopoulos S. Biri G. Borchert W. Breunlich M. Cargnelli J.-P. Egger H. Fuhrmann D. Gotta M. Giersch A. Gruber M. Hennebach P. Indelicato T. S. Jensen F. Kottmann Y.-W. Liu B. Manil V. M. Markushin J. Marton N. Nelms G. C. Oades G. Rasche P. A. Schmelzbach L. M. Simons J. Zmeskal |
| Affiliation: | 1. Department of Material Science, University of Ioannina, GR-45110, Ioannina, Greece 2. Institut of Nuclear Research, Hungarian Academy of Science, H-4001, Debrecen, Hungary 3. Institut für Kernphysik, Forschungszentrum Jülich, D-52425, Jülich, Germany 4. Institut für Mittelenergiephysik, ?sterreichische Akademie der Wissenschaften, A-1090, Vienna, Austria 5. Institut de Physique, Université de Neuchatel, CH-2000, Neuchatel, Switzerland 6. Institut für Kernphysik, Forschungszentrum Jülich, D-52425, Jülich, Germany 7. Laboratoire Kastler-Brossel, Université Pierre et Marie Curie, F-75252, Paris, France 8. Institut für Theoretische Physik, CH-8057, Zürich, Switzerland 9. Institut für Teilchenphysik, ETHZ, CH-8093, Zürich, Switzerland 10. Paul-Scherrer-Institut (PSI), CH-5232, Villigen, Switzerland 11. Department of Physics and Astronomy, University of Leicester, Leicester, LEI7RH, UK 12. Institute of Physics, Aarhus University, DK-8000, Aarhus, Danmark |
| Abstract: | The measurement of the strong-interaction effects in pionic hydrogen gives access to fundamental properties of the pion–nucleon interaction. Methods developed within the framework of Heavy-Baryon Chiral Perturbation Theory allow calculations with an accuracy of a few per cent, which should be tested by experiment. Techniques advanced for recent experiments on the precision spectroscopy of X-rays from antiprotonic and pionic atoms will be used in a new series of measurements for pionic hydrogen. The aim is to achieve finally an accuracy of 0.2% for the hadronic shift ∈1s and most important of about 1% for the broadening Γ1s . An essential part of the experimental program is an improved understanding of the atomic cascade. At first, the value of ∈1s has to be proven not to be influenced by molecular formation. Secondly, a more accurate determination of Γ1s requires a detailed study of Coulomb deexcitation. This revised version was published online in August 2006 with corrections to the Cover Date. |
| Keywords: | exotic atoms pionic hydrogen pion– nucleon interaction cascade |
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