Essays about: "feynman"

Showing result 6 - 10 of 27 essays containing the word feynman.

  1. 6. Calculating scattering amplitudes in φ3 and Yang-mills theory using perturbiner methods

    University essay from Uppsala universitet/Teoretisk fysik

    Author : Daniel Nilsson; Magnus Bertilsson; [2022]
    Keywords : QFT; Quantum; Quantum field theory; scattering amplitudes; Berends Giele Currents; feynman diagrams; n particle scattering;

    Abstract : We calculate tree-level scattering amplitudes in φ^3 theory and Yang-Mills theory by means of the perturbiner expansion. This involves solving the Euler-Lagrange equations of motion perturbatively via a multi-particle ansatz, and using Berends-Giele recursion relations to extract the solution from simple on-shell data. READ MORE

  3. 7. Higgs Boson Decay to Two Photons : Probing the Standard Model

    University essay from Stockholms universitet/Fysikum

    Author : Daniel Slominski; [2022]
    Keywords : ;

    Abstract : The Higgs to Two Photon decay channel is analyzed to one-loop in the Feynman gauge.  Triangle loop processes are evaluated using dimensional regularization due to divergent integrals.  The build up to Higgs physics is given by way of gauge theories in the Standard Model where we can then introduce the Higgs field. READ MORE

  4. 8. Green's Functions Investigations in Quantum Transport Geometries

    University essay from Lunds universitet/Matematisk fysik; Lunds universitet/Fysiska institutionen

    Author : Philip Johansson; [2022]
    Keywords : Quantum transport; Green s functions; self-energy; non-equilibrium; many-body physics; Physics and Astronomy;

    Abstract : In this thesis we employ the non-equilibrium Green’s function (NEGF) method to study both finite and infinite systems. We develop a codebase capable of computing the steady state interacting NEGF in open systems, i.e. READ MORE

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

    University essay from Lunds universitet/Teoretisk partikelfysik - Geonomgår omorganisation

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

    Abstract : 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. READ MORE

  6. 10. Helicity amplitudes for the transition from the spin-3/2 Sigma to the Lambda hyperon

    University essay from Uppsala universitet/Kärnfysik

    Author : Olov Junker; [2020]
    Keywords : hyperons; helicity amplitudes; dispersion theory; chiral perturbation theory;

    Abstract : The helicity amplitudes of the scattering reaction Sigma* bar Lambda -> pi+ pi- at energies below 1 GeV are calculated. They are part of a project of determining the low energy Sigma* to Lambda transition form factors using dispersion theory. The helicity amplitudes require the Feynman amplitudes of Sigma* bar Lambda -> pi+ pi- as input. READ MORE