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  • 301.
    Jovicevic, Jelena
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Performance of b-jet identification in ATLAS2014In: Nuovo cimento della societa italiana de fisica. C, Geophysics and space physics, ISSN 1124-1896, E-ISSN 1826-9885, Vol. 37, no 6, p. 123-128Article in journal (Refereed)
    Abstract [en]

    A performant identification of the jets originating from b-quarks is one of the key ingredients which allows for the diverse physics program of the ATLAS experiment. Algorithms for the b-jet identification in ATLAS are exploiting the long lifetime and the high mass of the b-hadrons, as well as the information on the tracks associated with jets. The performance of these algorithms is measured in data to enable reliable usage in the physics analyses. In this article, the performance of the multivariate technique MV1 for b-jet identification, which as its inputs takes information from the other b-jet identification algorithms in ATLAS, is presented. The efficiency of the MV1 algorithm is measured using dileptonic top pair events and is based on a likelihood approach. This approach allows to exploit per-event flavour and momentum correlations between the two jets. Correction factors which take into account differences in the b-jet identification efficiencies in simulation and data are derived as a function of jet transverse momentum and pseudo-rapidity. All the results are derived using the proton-proton collision dataset at centre of mass energy of √s = 8TeV corresponding to an integrated luminosity of L ≈ 20.3 fb-1.

  • 302.
    Jovicevic, Jelena
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Probing the Standard Model Higgs boson in the WW decay mode with the ATLAS detector at the LHC2013Licentiate thesis, monograph (Other academic)
    Abstract [en]

    This thesis is concerns an analysis to probe the Higgs boson in the H→WW(*)→lvlv decay mode, one of three analyses contributing to the discovery of the Higgs boson at a mass of mH = 125 GeV in July 2012. The dataset used are the proton-proton collisions collected with the ATLAS detector at the CERN Large Hadron Collider during 2012 at a centre of mass energy of 8 TeV, and correspond to a total integrated luminosity of 13.0 fb-1. An excess of events is observed in the data over the expected number of background events. The significance of the excess is estimated to be 2.8 standard deviations and the signal strength, defined as a ratio of the observed cross-section for the signal to the cross section predicted for a Standard Model Higgs boson with a mass of 125 GeV, is measured to be υ = 1:5 ± 0:6. At present, all results in the H→WW(*)→lvlv decay mode concerning the newly discovered particle are compatible with the expectations from the Standard Model for a Higgs boson with a mass of mH = 125 GeV.

    In addition, an optimisation of the thresholds used to check the stability of the electronics calibration constants in the ATLAS Liquid Argon Calorimeter is presented. The calibration constants enters the calculation of the energy of the individual cells in the calorimeter and have to be validated regularly. The study is performed on calibration data from 2010 and 2011. New thresholds, based on the statistical behavior of the calibration constants, are determined separately for the different calorimeter regions.

4567 301 - 302 of 302
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