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Identification d'électrons et application à la mesure de la section efficace de production du quark top avec le détecteur D0 au TeVatron

Abstract : The tagging of heavy flavour quarks is crucial for several standard model studies such as the Higgs boson identification through its decay into b quark pairs, or top quark studies. The reconstruction of electrons and muons inside jets is one of the tools used for heavy flavour tagging. In D0 at Run 1, only soft muon tagging was possible since there was no magnetic field in the central detector. The detector has been upgraded for Run 2, and heavy flavour tagging with electrons became possible thanks to a new superconducting magnet.
I developed the so-called road algorithm for this purpose. It benefits from the new capability of the tracker and from the good calorimeter properties. Its performance are studied in detail with generated events as well as with real data. The identification efficiency and the mis-identification rate are determined with physics signals. The capability of the road method for b tagging is demonstrated.
Heavy flavour tagging with leptons in jets can be efficiently applied to the top quark "rediscovery". Indeed, the leptons from semi-leptonic decays of b quarks are very hard and central. The analysis is carried out in the electron-plus-jet and muon-plus-jet channels simultaneously. For the first measurement of the cross section of top quark production in Run 2, only the tagging with muons is used. The tagging with electrons requires a specific optimization, but once it is performed the good efficiency of the road method is confirmed. Several ways to improve it are proposed. One of the most promising is the extension of the road method to the preshower detectors.
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https://tel.archives-ouvertes.fr/tel-00003152
Contributor : Catherine Eguren <>
Submitted on : Thursday, July 24, 2003 - 10:26:32 AM
Last modification on : Wednesday, October 14, 2020 - 4:00:12 AM
Long-term archiving on: : Friday, April 2, 2010 - 6:40:40 PM

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  • HAL Id : tel-00003152, version 1

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LAL | CNRS | IN2P3

Citation

Florian Beaudette. Identification d'électrons et application à la mesure de la section efficace de production du quark top avec le détecteur D0 au TeVatron. Physique des Hautes Energies - Expérience [hep-ex]. Université Paris Sud - Paris XI, 2003. Français. ⟨tel-00003152⟩

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