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Production de paires de Top et effet de Nouvelle Physique. Calibration des jets légers avec le processus W en jet-jet. Mesure de la masse du Top

Abstract : Since it was discovered in 1995 at Fermilab, the Top quark is the subject of a great attention. It completes the third quark generation of the Standard Model of particle physics, and the measurement of its properties constrains strongly this model. It is also a preferential way to probe new physics expected around 1 TeV. This thesis, performed using the ATLAS detector at LHC, describes the methods implemented in order to measure precisely the Top quark mass in the lepton+jets channel. Several analysis ways are presented in function of the performances of the detector, especially its capacity to identify the b jets. The precise measurement of the Top quark mass needs a deep understanding of the jet energy scale. This thesis suggests a strategy to calibrate the light jets using the constraint on the W boson mass, and shows that a precision of 1 GeV/c² on the Top mass measurement is achievable. An evaluation of the discovery potential of ttbar resonances, foreseen by models beyond the Standard Model, is also carried out.
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https://tel.archives-ouvertes.fr/tel-00178221
Contributor : Jeanine Pellet <>
Submitted on : Wednesday, October 10, 2007 - 2:18:37 PM
Last modification on : Thursday, February 25, 2021 - 10:58:21 AM
Long-term archiving on: : Sunday, April 11, 2010 - 10:43:13 PM

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  • HAL Id : tel-00178221, version 1

Citation

E. Cogneras. Production de paires de Top et effet de Nouvelle Physique. Calibration des jets légers avec le processus W en jet-jet. Mesure de la masse du Top. Physique des Hautes Energies - Expérience [hep-ex]. Université Blaise Pascal - Clermont-Ferrand II, 2007. Français. ⟨tel-00178221⟩

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