Abstract
Major successes in high energy physics recently have come in the searches for basic constituents of matter and in the attempts to understand their interactions. Electron-positron collisions provide a particularly clean way to study the nature of the fundamental constituents of matter and their interactions because of the point-like nature of leptons. Experiments here are free of the complications that arise in studies of hadron-hadron or lepton-hadron collisions, where the hadrons themselves have a complex internal structure which must be understood in detail before new information on the large q2 interactions of the constituents can be extracted. Therefore e+eā collisions at high CM energies can be directly used to probe the very fundamental questions ā e.g., what are the evidences for gluons? What is the spin and the coupling constant? How many quarks and leptons are there? Are there additional weak bosons with mass below that predicted by the standard models? How large are the weak interaction coupling constants for neutral leptonic currents?
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Chen, M. (1983). Recent Results from PETRA. In: Capri, A.Z., Kamal, A.N. (eds) Particles and Fields 2. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-3593-1_7
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