DASP Experiment at DORIS


It was in 1972 that physicists at Faculty of Science, University of Tokyo, participated in planning an experiment called DASP at an electron-positron collider DORIS, which was then being built at the DESY (Deutsches Electron Synchrotron) laboratory in Germany, to investigate the fundamental structure of the elementary particles. This decision was based on an early recognition that electron-positron collider experiments have a high potential of finding new particles as well as of making unambiguous measurements, which was not yet generally understood at that time.

In 1974 the High Energy Physics Laboratory (HEPL), the predecessor of ICEPP, was established in Faculty of Science, University of Tokyo, with a term of five years. HEPL took charge of the design of the experiment, the construction of the electromagnetic shower counters, and the development and construction of the proportional counters.

The experiment started just after the historic discovery of the charm particles. Its important achievements included:

The electromagnetic shower counters constructed by HEPL proved essential in these studies, and the HEPL physicists made primary contributions in the physics analyses.

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hisho@icepp.s.u-tokyo.ac.jp