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000890777 245__ $$aRedetermination of the strong-interaction width in pionic hydrogen
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000890777 520__ $$aThe hadronic width of the ground state of pionic hydrogen has been redetermined by X-ray spectroscopy to be  meV. The experiment was performed at the high-intensity low-energy pion beam of the Paul Scherrer Institute by using the cyclotron trap and a high-resolution Bragg spectrometer with spherically bent crystals. Coulomb de-excitation was studied in detail by comparing its influence on the line shape by measuring the three different transitions K, K, and K at various hydrogen densities. The pion-nucleon scattering lengths and other physical quantities extracted from pionic-atom data are in good agreement with the results obtained from pion-nucleon and nucleon-nucleon scattering experiments and confirm that a consistent picture is achieved for the low-energy pion-nucleon sector with respect to the expectations of chiral perturbation theory.
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000890777 7001_ $$0P:(DE-HGF)0$$aAnagnostopoulos, D. F.$$b1
000890777 7001_ $$0P:(DE-HGF)0$$aCovita, D. S.$$b2
000890777 7001_ $$0P:(DE-HGF)0$$aFuhrmann, H.$$b3
000890777 7001_ $$0P:(DE-Juel1)133892$$aGorke, H.$$b4
000890777 7001_ $$0P:(DE-Juel1)131168$$aGotta, D.$$b5$$eCorresponding author
000890777 7001_ $$0P:(DE-Juel1)164209$$aGruber, A.$$b6
000890777 7001_ $$0P:(DE-HGF)0$$aHennebach, M.$$b7
000890777 7001_ $$0P:(DE-HGF)0$$aIndelicato, P.$$b8
000890777 7001_ $$0P:(DE-HGF)0$$aJensen, Th. S.$$b9
000890777 7001_ $$0P:(DE-HGF)0$$aBigot, E.-O. Le$$b10
000890777 7001_ $$0P:(DE-HGF)0$$aLiu, Y.-W.$$b11
000890777 7001_ $$0P:(DE-HGF)0$$aMarkushin, V. E.$$b12
000890777 7001_ $$0P:(DE-HGF)0$$aMarton, J.$$b13
000890777 7001_ $$0P:(DE-Juel1)131269$$aNekipelov, M.$$b14
000890777 7001_ $$0P:(DE-HGF)0$$aSantos, J. M. F. dos$$b15
000890777 7001_ $$0P:(DE-HGF)0$$aSimons, L. M.$$b16
000890777 7001_ $$0P:(DE-HGF)0$$aStrauch, Th.$$b17
000890777 7001_ $$0P:(DE-HGF)0$$aTrassinelli, M.$$b18
000890777 7001_ $$0P:(DE-HGF)0$$aVeloso, J. F. C. A.$$b19
000890777 7001_ $$0P:(DE-HGF)0$$aZmeskal, J.$$b20
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