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Production de paires de Z et polarisation des W à LEP2 avec le détecteur ALEPH ou Prolégomènes à toute étude future sur les bosons de Jauge qui pourra se présenter comme exhaustive

Abstract : The start of LEP2 at energies in the centre of masse above the W-pair production threshold, has made possible for the first time to test the least bounded sector of the Standard Model, the bosonic sector.
This thesis consists in three strong measurements of the validity of the Standard Model using the whole LEP2 data set recorded by the ALEPH detector :
- The measurement of the ZZ cross section through the five visible decay channels of the Z-pair.
- The measurement of the anomalous neutral gauge couplings in tile ZZ final state. These couplings are forbidden in the Standard Model and their existence would be the sign of a New Physics. The information on the cross section as well as the angular distribution of the Z is used to extract them.
- The measurement of the longitudinal and transverse polarised states of the W bosons through the W+W- production in the semi-leptonic channel. The spin density matrix method is used because it introduces a "model independent" framework. No deviation is observed with respect to the Standard Model predictions.
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https://tel.archives-ouvertes.fr/tel-00001884
Contributor : Admin Base Des Publications de l'In2p3 <>
Submitted on : Monday, October 28, 2002 - 4:03:36 PM
Last modification on : Tuesday, April 20, 2021 - 12:00:09 PM
Long-term archiving on: : Friday, April 2, 2010 - 6:32:45 PM

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  • HAL Id : tel-00001884, version 1

Citation

David Fayolle. Production de paires de Z et polarisation des W à LEP2 avec le détecteur ALEPH ou Prolégomènes à toute étude future sur les bosons de Jauge qui pourra se présenter comme exhaustive. Physique des Hautes Energies - Expérience [hep-ex]. Université Blaise Pascal - Clermont-Ferrand II, 2002. Français. ⟨tel-00001884⟩

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