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Triangle Loop in Scalar Decay and Cutting Rules
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
2013 (English)Student paper other, 10 HE creditsStudent thesis
##### Abstract [en]

In this report we will calculate the amplitude for a scalar-to-scalars (φ$\rightarrow$ 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.

We will derive simple cutting rules closely related to the imaginary part of the amplitude. In doing this, we derive a formula that deals with expressions of the form δ[f(x,y)]δ[g(x,y)], containing two Dirac delta functions.

2013. , 35 p.
##### Series
FYSAST, FYSPROJ1003
##### Keyword [en]
Cutkosky cutting rules, Feynman triangle loop diagram, two-fold Dirac delta functions, double Dirac delta functions, Dirac delta distribution, delta distribution
##### National Category
Subatomic Physics
##### Identifiers
OAI: oai:DiVA.org:uu-212511DiVA: diva2:678167
##### Educational program
Master Programme in Physics
##### Examiners
Available from: 2013-12-19 Created: 2013-12-11 Last updated: 2014-11-20Bibliographically approved

#### Open Access in DiVA

##### File information
File name FULLTEXT01.pdfFile size 514 kBChecksum SHA-512
Type fulltextMimetype application/pdf

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