First year of Mark-J: physics with high energy electron-positron colliding beams. Report No. 107
This report reviews the experimental investigation of high energy e/sup +/e/sup -/ interactions by the MARK J collaboration at PETRA, the electron-positron colliding beam accelerator at DESY in Hamburg, West Germany. The physics objectives include studies of several purely electromagnetic processes and hadronic final states, which further our knowledge of the nature of the fundamental constituents and of their strong, electromagnetic and weak interactions. Before discussing the physics results, the main features and the principal components of the MARK J detector are discussed in terms of design, function, and performance. Several aspects of the online data collection and the offline analysis are also outlined. Results are presented on tests of quantum electrodynamics using e/sup +/e/sup -/ ..-->.. e/sup +/e/sup -/, ..mu../sup +/..mu../sup -/ and tau/sup +/tau/sup -/, on the measurement of R, the ratio of the hadronic to the point-like muon pair cross section, on the search for new quark flavors, on the discovery of three jet events arising from the radiation of hard noncollinear gluons as predicted by quantum chromodynamics, and on the determination of the strong coupling constant ..cap alpha../sub s/.
- Research Organization:
- Massachusetts Inst. of Tech., Cambridge (USA). Lab. for Nuclear Science
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76ER03069
- OSTI ID:
- 6949353
- Report Number(s):
- DOE/ER/03069-779; TRN: 80-018844
- Country of Publication:
- United States
- Language:
- English
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ON-LINE MEASUREMENT SYSTEMS
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DATA ACQUISITION
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