Precision Spectroscopy of Pionic Atoms: From Pion Mass Evaluation to Tests of Chiral Perturbation Theory
Martino Trassinelli
Abstract
Preliminary results of the strong interaction shift and width in pionic hydrogen (πH) using an X-ray spectrometer with spherically bent crystals and CCDs as X-ray detector are presented. In the experiment at the Paul Scherrer Institute three different (np 1s) transitions in πH were measured. Moreover the pion mass measurement using the (5 4) transitions in pionic nitrogen and muonic oxygen is presented
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