Essays about: "spinor-helicity"

Showing result 6 - 7 of 7 essays containing the word spinor-helicity.

1. 6. 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

3. 7. The double-copy method for supergravity amplitudes

   University essay from Uppsala universitet/Teoretisk fysik

   Author : Maor Ben-Shahar; [2019]
   Keywords : Supergravity; quantum field theory; counterterm; amplitudes;

   Abstract : The double-copy construction enables the calculation of scattering amplitudes in theories of gravity by combining amplitudes from gauge theories. It relies on obtaining numerators that obey a duality between color and numerator factors, called color-kinematics duality. READ MORE