Gießen 2007 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 29: Elektromagnetische und Hadronische Sonden

HK 29.5: Talk

Wednesday, March 14, 2007, 15:15–15:30, A

Pionic deuterium — Dimitrios Anagnostopoulos¹, Daniel Covita², Hubert Gorke³, Detlev Gotta³, Alexander Gruber⁴, Albert Hirtl⁴, Paul Indelicato⁵, Eric-Olivier Le Bigot⁵, Johann Marton⁴, Mikhael nekipelov³, Joaquim dos Santos², Philipp Schmid⁴, Sophie Schlesser⁵, Leopold Simons⁶, •Thomas Strauch³, Joao Veloso² und Johann Zmeskal⁴ — ¹Univ. Ioannina, Greece — ²Univ. Coimbra, Portugal — ³IKP,FZ Jülich — ⁴Stefan Meyer Inst., Wien — ⁵Lab. Kastler-Brossel, Univ. Paris VI — ⁶PSI, Villigen

Data taking of the project PIONIC HYDROGEN has been completed with a high statistics study of the strong–interaction effects by measuring the Kβ X–radiation in π D. The π D hadronic shift will provide a constraint for π N isospin scattering lengths extracted from the π H measurement. In addition, as an outstanding case in charged pion–nucleon interactions the shift is very sensitive to isospin-breaking corrections owing to the almost complete cancellation of the pion–proton and pion–neutron scattering lengths. Secondly, the hadronic width is directly related to pion production processes at threshold, which is subject of continuing theoretical efforts within the framework of Chiral Perturbation Theory. The measurement was performed at the Paul Scherrer Institut, Switzerland, using the cyclotron trap and a high–resolution Bragg crystal spectrometer. By measuring the density dependence cascade effects can be identified and corrected in order to allow an unambiguous determination of the strong–interaction effects. First results of the new π D experiments will be discussed.