Hadronic shift in pionic hydrogen
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, and J. Zmeskal
TL;DR
This paper reports a precise measurement of the hadronic shift in pionic hydrogen using advanced X-ray spectroscopy techniques at PSI, providing improved accuracy over previous results.
Contribution
It presents a new, highly accurate determination of the hadronic shift in pionic hydrogen through innovative experimental setup and calibration methods.
Findings
Hadronic shift measured as 7.086 eV with small uncertainties
Utilized high-resolution Bragg spectrometer with bent crystals
Achieved improved precision over prior measurements
Abstract
The hadronic shift in pionic hydrogen has been redetermined to be \,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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