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An S matrix analysis of the Z resonance

Document type: Articulo

Abstract

The S matrix ansatz is a rigorously model independent approach to describe the cross-sections and asymmetries in e+e- annihilation. Using the cross-sections and asymmetries measured with the L3 detector during the 1990 and 1991 running period, we determine the mass and the width of the Z boson, the contributions of the Z exchange and of the yZ interference. Including the polarization of the t lepton in the analysis, the leptonic helicity amplitudes of the scattering process are determined assuming lepton universality. The results are compared with other model independent ansatzes as realized in ZFITTER. A systematic bias of the Z mass due to the yZ interference term is detected, which leads to an underestimation of the error on mz for model independent determinations.

General information

Issue date: 7 de octubre de 1993
Document language: English
Journal: Physics Letters B; vol. 315, no. 3-4
Origin: Facultad de Ciencias Exactas
ISSN: 0370-2693
Pages: 494-502
xmlui.dri2xhtml.METS-1.0.item-dc-subject: Z boson ; S matrix
Subjects: Ciencias Exactas ; Física

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Created: 19 de septiembre de 2019
Available since: 19 de septiembre de 2019
Please, use one of this identificators(URI) for cite o linking this item:
  • http://sedici.unlp.edu.ar/handle/10915/81607
  • https://doi.org/10.1016/0370-2693(93)91646-5

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    Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) Except where otherwise noted, this item's license is described as Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)