RESEARCH PROJECT

Proposal

Abstract

We propose to measure the strong interaction width and shift of the ground of pionic hydrogen in order to determine the pion-nucleon scattering lengths for both isospin components a+ and aˉ with a relative accuracy of better than 10ˉ². The scattering length aˉ extracted from the width measurement has a direct relation to the pion-nucleon coupling constant and can be directly compared with predictions of chiral perturbation theory. Systematic errors of the width measurement caused by Doppler broadening can be corrected by comparing simultaneous experiments with pionic and muonic hydrogen atoms. The present experiment serve to test the Quantum chromodynamic QCD at low energies. For more description of the experiments see:at Paul Scherrer Institute PSI

SELECTED PUBLICATIONS

• Pressure Dependence of Ground State Schift and Width in pionic Hydrogen. The collaboration. Deutsche Physicalische Gesellschafte (2002).
• The pion –nucleon scattering lengths from pionic hydrogen and deuterium. The RCS3 collaboration. European Physical Journal C ( particles and fields) C21, 473-488 (2001)
• Determination of the пN scattering lengths from pionic hydrogen. The RCS3 collaboration .Physics Letters B 469 (1999) 25-29.
• X – ray spectroscopy of the pionic deuterium atom. The RCS3 collaboration . Nuclear Physics A625. 1997.
• The strong interaction shift and width of the ground state of pionic hydrogen. The RCS3 collaboration. Nuclear Physics A609. 1996.
• The strong interaction shift and width of the 1s level. The RCS3 collaboration . Physics Review Letter 75. 1995.
• Measurement of the 1s state in pionic hydrogen. The RCS3 collaboration . Nuclear Physics A585. 1995.
• The measurement of the absolute yields of the Lyman transitions in pionic hydrogen and deuterium. The RCS3 collaboration . Zeischrift fur Physik A- Hadron and Nuclei, Spring-Verlag A 351. 1995.
• Determination of the D wave in pionic deuterium with a high resolution crystal spectrometer. The RCS3 collaboration. Physics Review Letter 74. 1995.
• The Strong interaction of the ground state in pionic atoms (H,D). The RCS3 collaboration . Muon on solid state Physics and Chemistry PSI. Newsletter. 1994.
• Measurement of the strong interaction shifts and widths in pionic Helium isotopes. The RCS3 collaboration. PANIC, U.S.A. 1993.
• A Measurement of the Strong Interaction of the 1S level. The RCS3 collaboration . Nuclear and Particles Physics PSI Newsletter. Nuclear and Particles Physics PSI Newsletter. 1993.
• A High resolution reflecting crystal spectrometer to measure 3 Kev pionic hydrogen and deuterium x rays. The RCS3 collaboration. Nuclear Instruments and Methods in Physics Research A335. 1993.
• First measurement with the improved crystal spectrometer at the new piE5 beam. The RCS3

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