Sökning: "lepton"

Visar resultat 1 - 5 av 33 uppsatser innehållade ordet lepton.

  1. 1. Constraining the Higgs width in Higgs production associated with a top quark pair

    Kandidat-uppsats, Lunds universitet/Fysiska institutionen; Lunds universitet/Teoretisk partikelfysik - Geonomgår omorganisation

    Författare :Benjamin Dahlén; [2023]
    Nyckelord :Higgs; width; cross section; on-shell; off-shell; invariant mass; Standard model; upper bound; Physics and Astronomy;

    Sammanfattning : In this thesis we study the width of the Higgs boson in the process pp → t ̄t 4l at LO using MadGraph5_aMC@NLO to generate the events. The contributions including the Higgs signal, continuum background and interference were considered in order to calculate the expected number of events in a broad range of four-lepton invariant masses. LÄS MER

  3. 2. Determining backgrounds with misidentified leptons in the ATLAS Higgs boson analysis

    Master-uppsats, KTH/Fysik

    Författare :Leo Qiyuan Hu; [2023]
    Nyckelord :Particle Physics; ATLAS detector; Fake Factor method; Higgs boson; lepton misreconstruction; misidentified events; Partikelfysik; ATLAS detektorn; Fake Factor-metoden; Higgs boson; lepton felrekonstruktion; felidentifierade händelser;

    Sammanfattning : This thesis presents an analysis of misidentified leptons in the Higgs boson decaychannel H → W W ∗ → lνlν. Misidentified leptons, resulting from jets misidentifiedas leptons, mimic the signal of a Higgs boson decay, resulting in a backgroundcontribution to the signal. LÄS MER

  4. 3. Neutrino Oscillations and Scalar Non-Standard Interactions at ESSnuSB

    Master-uppsats, KTH/Fysik

    Författare :William Brorsson; [2023]
    Nyckelord :;

    Sammanfattning : This report consists of two parts. Firstly, an introduction to neutrino oscillations is presented. This includes introducing neutrino mass terms into the standard model, the leptonic mixing matrix, neutrino oscillations in vacuum and neutrino oscillations in matter. LÄS MER

  5. 4. Spin correlations in top quark pair production at the Large Hadron Collider

    Kandidat-uppsats, Lunds universitet/Teoretisk partikelfysik - Geonomgår omorganisation

    Författare :Simon Ahlstedt; [2022]
    Nyckelord :Top quarks; Top quark pair production; LHC; Spin correlations; MadGraph5_aMC@NLO; Dilepton decay channel; Leading order; Interference effects; Event generation.; Physics and Astronomy;

    Sammanfattning : In this work we investigate the spin correlation effect of the interference between signal and irreducible background events present in top quark pair production at the LHC at LO in the dilepton channel. To simulate the high energy proton-proton collisions of the LHC, MadGraph5_aMC@NLO framework is used as an event generator. LÄS MER

  7. 5. Simplified likelihoods for stop searches with one lepton in ATLAS

    Master-uppsats, Stockholms universitet/Fysikum

    Författare :Karl Lundkvist; [2022]
    Nyckelord :supersymmetry; particle; physics; stop; squark; neutralino; MSSM; pMSSM;

    Sammanfattning : .... LÄS MER