Sökning: "Feynman triangle loop diagram"

Hittade 2 uppsatser innehållade orden Feynman triangle loop diagram.

1. 1. Triangle Loop in Scalar Decay and Cutting Rules

   L3-uppsats, Uppsala universitet/Institutionen för fysik och astronomi

   Författare :Hazhar Ghaderi; [2013]
   Nyckelord :Cutkosky cutting rules; Feynman triangle loop diagram; two-fold Dirac delta functions; double Dirac delta functions; Dirac delta distribution; delta distribution;

   Sammanfattning : In this report we will calculate the amplitude for a scalar-to-scalars (φ3  φ2φ2) decay which involves a triangle loop. We compute the real and imaginary part of the amplitude separately and will argue that this is much more straightforward and practical in this case rather than having to deal with or worry about branch cuts of logarithms. LÄS MER

3. 2. The Rare Decay of the Neutral Pion into a Dielectron

   Master-uppsats, Uppsala universitet/Kärnfysik

   Författare :Hazhar Ghaderi; [2013]
   Nyckelord :rare pion decay; Mellin transform; Mellin-Barnes representation; dispersive representation; dispersion relation; Kramers-Kronig relations; Cutkosky cutting rules; Feynman Loop diagram calculations;

   Sammanfattning : We give a rather self-contained introduction to the rare pion to dielectron decay which in nontrivial leading order is given by a QED triangle loop. We work within the dispersive framework where the imaginary part of the amplitude is obtained via the Cutkosky rules. We derive these rules in detail. LÄS MER