Sökning: "ttbar"

Hittade 4 uppsatser innehållade ordet ttbar.

  1. 1. Search for Higgs-like bosons through optimization of top-quark modelling

    Magister-uppsats, Lunds universitet/Partikel- och kärnfysik; Lunds universitet/Fysiska institutionen

    Författare :Rafael Antonio Lopez; [2021]
    Nyckelord :ttbar; top quark modelling; BSM; 2HDM S; Higgs-like bosons; ATLAS; HWW; XSh; top estimation; top remodelling; Physics and Astronomy;

    Sammanfattning : Accurate estimations of background processes associated with top-quarks are vital to studies concerned with finding new physics at the Large Hadron Collider (LHC)at CERN. Search for Higgs-like bosons in the ATLAS experiment at LHC was performed by optimising the use of b-jet tagging algorithms and improving on tt backgroundmodelling. LÄS MER

  3. 2. Measurement of the charge asymmetry in top quark pair decay in dilepton (e,mu) channel in pp collision data at √ s = 7 TeV using the ATLAS detector

    Magister-uppsats, Lunds universitet/Fysiska institutionen

    Författare :Donya Mashaallah Poor; [2014]
    Nyckelord :particle physics; ATLAS experiment; top quark pair; charge asymmetry; dilepton; Physics and Astronomy;

    Sammanfattning : In this thesis the charge asymmetry of the dileptonic (e,mu) channel decay of top quark pair is presented, which is studied in proton-proton collisions at sqrt(s) = 7 TeV, using data corresponding to an integrated luminosity of 4.5 fb^(-1) collected by the ATLAS detector. LÄS MER

  4. 3. Charged Higgs Boson Studies in the Channel pp→a1h±→4b+l+MET in the Next-to MSSM (NMSSM) with the ATLAS Experiment

    Master-uppsats, Högenergifysik

    Författare :Stephan Zimmer; [2010]
    Nyckelord :ATLAS; Charged Higgs; NMSSM; Beyond Standard Model; Supersymmetry; MSSM;

    Sammanfattning : Next-to-minimal super-symmetric extensions of the Standard Model (SM) predict the existence of several non-SM like Higgs bosons. The process pp→a1h±→4b+W involves the production and the decay of a spin-0 charged Higgs boson and a CP-odd Higgs boson a1 which can have a sizable cross section in the NMSSM. LÄS MER

  5. 4. Charged Higgs Boson Studies in ttbar -Dilepton Events at the LHC

    L3-uppsats, Högenergifysik

    Författare :Stephan Zimmer; [2009]
    Nyckelord :Charged Higgs; Supersymmetry; ttbar; Dilepton; Spin Distribution;

    Sammanfattning : A generator-level study of dilepton ttbar events to search for light charged Higgs bosons at the LHC is presented with the aim of finding a new variable to discriminate between charged Higgs signals and Standard Model signatures. The spin effects in leptonic decays of H± and W bosons are studied and a new angular distribution is identified as a discriminating variable. LÄS MER