Workshop on a0 physics with ANKE. Proceedings

The workshop on ''a0 physics with ANKE'' was held at the Institute for Theoretical and Experimental Physics (ITEP) in Moscow on July 13/14, 2000. During the workshop the possibilities to study the nature of the scalar a0(980)-mesons with the ANKE spectrometer at the proton synchrotron COSY of the Forschungszentrum Juelich (FZJ) were intensively discussed. The nature of the lightest scalar mesons is a problem of fundamental interest in the physics of hadrons and one of the most important topics of present-day medium-energy physics. The workshop was triggered by a decision of the COSY program-advisory-committee (PAC) in May 2000. A proposal to measure the production of charged a0-mesons in the reaction pp → da0+ at ANKE received strong support and the corresponding beam time for a first experiment of two weeks was granted. It is scheduled for February 2001. One goal of the meeting at ITEP was a thorough preparation of those measurements. Another major point of interest was to develop ideas for future experiments with ANKE and to hear about recent theoretical achievements in the field of scalar mesons. About 35 scientists mostly from Russia and Germany joined the workshop and 16 talks were presented. This booklet starts with the approved proposals for a0+ measurements with ANKE. It contains a short summary of each talk as well as copies of the transparencies shown during the workshop. Finally, a list of responsibilities - as it was agreed on at the end of the meeting - is attached. (orig.)