Sökning: "QED"

Visar resultat 6 - 10 av 20 uppsatser innehållade ordet QED.

  1. 6. Radiative Corrections Beyond the Soft-Photon Approximation

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

    Författare :Jacob Lindahl; [2021]
    Nyckelord :Soft-Photon Approximation; Bremsstrahlung Correction; Transition Form Factor; Radiative Corrections; Physics and Astronomy;

    Sammanfattning : This thesis calculates the bremsstrahlung correction beyond the soft-photon approximation for the decay ω → π0 l+ l- . The effect of the radiative corrections on the extraction of the transition form factor from data is investigated. LÄS MER

  3. 7. Generalized Abelian Gauge Theory & Generalized Global Symmetry

    Master-uppsats, Uppsala universitet/Teoretisk fysik

    Författare :Emil Hössjer; [2020]
    Nyckelord :Differential characters; Wilson lines; generalized global symmetry; BF theory; Maxwell theory; spontaneous symmetry breaking; intersection number; selection rules; Noether theorem; sphere bundle; t Hooft operator;

    Sammanfattning : We study Cheeger-Simons differential characters in order to define higher form U(1) gauge fields and their Wilson lines. We then go on to define generalized global symmetries. This is a topological formulation of symmetries which has interesting consequences when the charged operators extend through space. LÄS MER

  4. 8. Mass-Singularity Structure of QED and Perturbative Quantum Gravity Scatterings

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

    Författare :Santiago Londono Castillo; [2020]
    Nyckelord :perturbative quantum gravity; QED; mass singularities; collinear singularities; soft singularities; singularity cancellation; graviton; Physics and Astronomy;

    Sammanfattning : In this thesis, the mass singularities occurring in the cross-section of electron scattering processes are investigated. Two types of scatterings are studied: Quantum Electrodynamics (QED) scatterings, and Perturbative Quantum Gravity (PQG) scatterings. LÄS MER

  5. 9. The Chirality-Flow Method for Massive and Electroweak Amplitudes

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

    Författare :Joakim Alnefjord; [2020]
    Nyckelord :chirality-flow; chirality; flow; spinor-helicity; tree-level; diagram; amplitude; Physics and Astronomy;

    Sammanfattning : In this thesis I extend the chirality-flow method to the full standard model at tree-level by including massive particles and electroweak interactions. The chirality-flow method is a new diagrammatic method for calculating Feynman diagrams that is based on the spinor-helicity formalism, that before this thesis was written had been worked out for massless QED and QCD at tree-level. LÄS MER

  7. 10. QFT and Spontaneous Symmetry Breaking

    Kandidat-uppsats, Uppsala universitet/Teoretisk fysik

    Författare :Sheila Chauwinoir; [2020]
    Nyckelord :quantum field theory; abelian and non-abelian gauge theories; quantum electrodynamics; quantum chromodynamics; electroweak interaction; spontaneous symmetry breaking; higgs mechanism;

    Sammanfattning : The aim of this project is to understand the structure of the Standard Model of the particle physics. Therefore quantum field theories (QFT) are studied in the both cases of abelian and non-abelian gauge theories i.e. quantum electrodynamics (QED), quantum chromodynamics (QCD) and electroweak interaction are reviewed. LÄS MER