Bose-Einstein correlations in e+e- events
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[S.l. : s.n.]
Number of pages
III, 135 p.
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Elementary particle physics tries to reveal the building blocks of all matter surrounding us and to study, describe and explain the properties of these building blocks. In this thesis so-called Bose-Einstein correlations (BEC) between particles originating from electron-positron collisions are analysed. The collisions take place at very high energies in the e+e-accelerator LEP, at the research institute CERN, nearby Geneva. The particles are detected with the L3 detector. Bose-Einstein correlations are observed and through mathematical operations on the data, information is obtained on the geometry and dynamics of multi-particle systems. The results of the analyses show that the particles are created in an ellipsoid-like source with a typical size of 1 femtometre (0.000000000000001 metre). It is also shown by the results that the production of these particles is consistent with an incoherent mechanism. Furthermore, the influence of these correlations on the measurement of the mass of the W particle (the important intermediate charged particle in the theory) is found to be small compared to previous predictions. This is due to the fact that no inter-W BEC are found in the decay of two W particles which are produced together
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