Hadronic shift in pionic hydrogen

preprint2014arXivOpen access

M. Hennebach D. F. Anagnostopoulos A. Dax H. Fuhrmann D. Gotta A. Gruber A. Hirtl P. Indelicato Y. -W. Liu B. Manil V. E. Markushin A. J. Rusi el Hassani L. M. Simons M. Trassinelli J. Zmeskal

physics.atom-ph nucl-ex

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The hadronic shift in pionic hydrogen has been redetermined to be $ε_{1s}=7.086\,\pm\,0.007(stat)\,\pm\,0.006(sys)$ \,eV by X-ray spectroscopy of ground state transitions applying various energy calibration schemes. The experiment was performed at the high-intensity low-energy pion beam of the Paul Scherrer Institut by using the cyclotron trap and an ultimate-resolution Bragg spectrometer with bent crystals.

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Hadronic shift in pionic hydrogen

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