Étiquetage des quarks b par un détecteur de vertex à pixels dans l'expérience ATLAS auprès du LHC

Abstract : The capability of the ATLAS detector to tag b-jets is studied, using the impact parameter of charged tracks. High b-tagging performance is needed at LHC, especially during the first years of running, in order to see evidence of the Higgs boson if its mass lies between 80 and 120 GeV/c2. A pattern-recognition algorithm has been developed for this purpose, using a detailed simulation of the ATLAS inner detector. Track-finding starts from the pixel detector layers. High track-finding efficiency and reconstruction quality ensure the discrimination of b-jets from other kinds of jets. After full simulation and reconstruction of H->bbbar, H->gg, H->uubar, H->ssbar and H->ccbar events (mH = 100 GeV/c2), the mean rejections achieved against non-b-jets for a 50% b-jet tagging efficiency are as follows: Rg = 39+-5 Ru = 60+-9 Rs = 38+-5 Rc = 9+-1 The analysis of data from the first radiation-hard pixel detector prototypes justifies the potential of these detectors for track-finding and high-precision impact parameter measurement at LHC.
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Contributor : Laurent Vacavant <>
Submitted on : Wednesday, November 16, 2005 - 7:03:20 PM
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Laurent Vacavant. Étiquetage des quarks b par un détecteur de vertex à pixels dans l'expérience ATLAS auprès du LHC. Physique des Hautes Energies - Expérience [hep-ex]. Université de la Méditerranée - Aix-Marseille II, 1997. Français. ⟨tel-00011011⟩

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