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Theses

Mesure de la section efficace de production de quarks top en paires dans le canal lepton+jets à D0 et à ATLAS et interprétation en terme de boson de Higgs chargé dans ATLAS.

Abstract : One of the main challenges of the current and future colliders TeVatron and LHC is the discovery of physics beyond the Standard Model. This goal may be accessible through precision measurements in the top quark sector. Deviations from theoretical predictions may bring to light the first indirect signs of new physics.

The work exposed in this thesis deals with the production cross-section of top quark pairs via the strong interaction, within both D0 and ATLAS collaborations.

Firstly, I've worked at D0 on the improvement of the reconstruction of soft electrons, in order to tag b-jets produced in top-antitop quarks events. Then I focused myself on the measurement of the top quark pair production cross-section with 420 pb-1 of D0 data. The measured cross-section is in agreement with the Standard Model expectations.

In the ATLAS experiment, I tried to develop a procedure in ordrer to select top quark pair events, using the knowledge and the techniques from the D0 experiment. This work also highlighted the main systematic sources that can affect the sensitivity of the measurement. After one year of data taking at low luminosity, this preliminary analysis obtains a sensitivity at a few percent level, leading to a good discovery potential of new physic signs, like charged Higgs bosons. These new particles appear in non minimal standard models, and modify the phenomenology of top pair events. This new analysis has shown a good sensitivity for some regions of the parameter space.
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https://tel.archives-ouvertes.fr/tel-00181009
Contributor : Florent Chevallier <>
Submitted on : Monday, October 22, 2007 - 5:36:48 PM
Last modification on : Thursday, November 19, 2020 - 12:58:53 PM
Long-term archiving on: : Sunday, April 11, 2010 - 11:34:47 PM

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  • HAL Id : tel-00181009, version 1

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Citation

Florent Chevallier. Mesure de la section efficace de production de quarks top en paires dans le canal lepton+jets à D0 et à ATLAS et interprétation en terme de boson de Higgs chargé dans ATLAS.. Physique des Hautes Energies - Expérience [hep-ex]. Université Joseph-Fourier - Grenoble I, 2007. Français. ⟨tel-00181009⟩

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