Sökning: "di-Higgs"

Visar resultat 1 - 5 av 7 uppsatser innehållade ordet di-Higgs.

  1. 1. Event categorisation and Machine-learning Techniques in Searches for Higgs Boson Pairs in the ATLAS Experiment at the LHC

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Högenergifysik

    Författare :Milads Emadi; [2023]
    Nyckelord :Particle Physics; ATLAS; BDT; Boosted Decision Tree; Decision Tree; Optimization; Machine Learning; Analysis;

    Sammanfattning : This thesis investigates the pair production of Higgs bosons (di-Higgs events) at the ATLAS experiment in the Large Hadron Collider (LHC), focusing on the channel where one Higgs boson decays into two bottom quarks and the other decays into two tau leptons. The main objective was to determine whether introducing a split in the invariant mass of the decay products from the two Higgs bosons (the di-Higgs mass) and using this as an analysis variable improves the sensitivity of the Boosted Decision Tree (BDT) machine learning algorithm to the di-Higgs signal. LÄS MER

  3. 2. Di-Higgs Production in the Standard Model and Beyond

    Master-uppsats, Stockholms universitet/Fysikum

    Författare :Hanna Brännström; [2021]
    Nyckelord :ATLAS; CERN; Higgs; partikelfysik; di-Higgs;

    Sammanfattning : This thesis examines how the kinetic properties of pair-produced Higgs bosons depend on whether the process is mediated by particles in the Standard Model or a simplified supersymmetric model. The analysis is based on simulated data made using MadGraph. LÄS MER

  4. 3. Towards observing HH with ATLAS: ZH production and assessing theoretical uncertainties

    Master-uppsats, KTH/Fysik

    Författare :Jonatan Gisslén; [2021]
    Nyckelord :;

    Sammanfattning : Even though the Standard Model of particle physics represents one of the triumphs of modern physics and seems to predict the outcome of any collision experiment, it has several shortcomings and therefore needs to be extended. After the discovery of the Higgs boson, one of the main aims of experimental particle physics is to probe the Standard Model for measurements that deviate from predictions, as this would imply new physics. LÄS MER

  5. 4. Sensitivity Study of Higgs Boson Pair Production with WWττ Final States at 13 TeV in the ATLAS Experiment

    Master-uppsats, Uppsala universitet/Högenergifysik

    Författare :August Wollter; [2019]
    Nyckelord :;

    Sammanfattning : This feasibility study concerns the implementation and analysis of a Higgs pair decaying to two W bosons, with hadronic final states, and to two τ-leptons, one with a leptonic and one with a hadronic final state, hh→ WhadWhad τlepτhad, in the ATLAS detector at the CERN Large Hadron Collider, by adapting the ``CxAOD framework'' software analysis code of the hh→ bbττ analysis. The purpose is to compare the sensitivity of this final state with other di-Higgs analyses in the ATLAS collaboration. LÄS MER

  7. 5. Unfolding of multivariate tools and statistical analysis for Higgs boson pair production searches in the ATLAS detector at the Large Hadron Collider

    Master-uppsats, Uppsala universitet/Högenergifysik

    Författare :Christina Dimitriadi; [2019]
    Nyckelord :;

    Sammanfattning : Recently, searches for pair production of Higgs bosons in several final states have been carried out by the ATLAS exeperiment at the Large Hadron Collider (LHC). This study focuses on the search for non-resonant di-Higgs production decaying to a final state with two b-jets and two τ-leptons using 36.1 fb-1 of data recorded by the ATLAS detector. LÄS MER