Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-11-12
Acta Phys.Polon. B28 (1997) 2317-2332
Physics
High Energy Physics
High Energy Physics - Phenomenology
15 pages, Latex, Lecture given at XXI School of Theoretical Physics of the University of Silesia, Katowice, 19-24 September 19
Scientific paper
The Z line shape is measured at LEP with an accuracy at the per mille level. Usually it is described in the Standard Model of electroweak interactions with account of quantum corrections. Alternatively, one may attempt different model-independent approaches in order to extract quantities like mass and width of the Z boson. If a fit deviates from that in the standard approach, this may give hints for New Physics contributions. I describe two model-independent approaches and compare their applications to LEP data with the Standard Model approach.
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