Abstract
The experimental program of the Pionic Hydrogen Collaboration aims at the measurement of the strong interaction induced shift and width of the pionic hydrogen 1s ground state with unprecedented precision. A sophisticated crystal spectrometer system is used to measure the X‐ray transitions to the ground state and thus the strong interaction shift and width with a precision of ∼ 2⋅10−3 and ∼10−2 respectively. The improvement in the precision of the width will amount to almost an order of magnitude compared to the most precise former experiment. From strong interaction shift and width the isospin‐dependent pion‐nucleon scattering lengths will be determined. From the scattering lengths the pion‐nucleon coupling constant and important information on chiral symmetry breaking can be deduced.
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