Drawing Feynman Graphs for D→KK Meson - Need Help!

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Discussion Overview

The discussion focuses on drawing Feynman graphs for the decay process D→KK meson, specifically addressing the number of diagrams involved and resources for further information. The scope includes technical aspects of diagram creation and theoretical understanding of particle decay processes.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant requests assistance in drawing Feynman graphs for the D→KK meson decay.
  • Another participant suggests using JaxoDraw for creating diagrams, noting the need for a Java runtime environment and a TeX installation for labeling.
  • A different participant mentions that any image editing program could suffice for creating a diagram, questioning whether the request is for finding an existing diagram or creating a new one.
  • One participant states that there is one dominant tree-level diagram for the decay process, assuming it refers to the D^0 → K^+ K^- decay.
  • Another participant adds that multiple diagrams may be needed for different D meson types (D0, D+, D-, Ds), while some diagrams may be suppressed or occur at higher levels.
  • A participant inquires about sources for more information on the D0 → K+ K− decay, specifically in the context of studying decay rates in QCD factorization.

Areas of Agreement / Disagreement

Participants express varying views on the number of diagrams associated with the D→KK meson decay, with some asserting a single dominant diagram while others suggest the need for multiple diagrams depending on the context. The discussion remains unresolved regarding the exact number of diagrams and the specifics of the decay process.

Contextual Notes

Participants mention the potential for GIM suppression in certain diagrams and the need for clarity regarding which D meson decay is being referenced. There are also indications of varying levels of expertise among participants regarding diagram creation tools.

Who May Find This Useful

This discussion may be useful for students and researchers interested in particle physics, specifically those studying meson decays and Feynman diagram representation.

ballestic2001
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Hi there, I need to draw the Feynman graphs for D→KK meson . I would be appreciate if anyone can help me.

Thank you so much.
 
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Get JaxoDraw from : http://jaxodraw.sourceforge.net/

If you have a java runtime environment it should work(you probably have java). If not find a JRE.

The only tricky part comes when you want to put labels in. Then you need a TeX installation like MikTeX, and to set it up properly and export it.
But if you just want diagrams and the ability to draw them, and to export them as say a .bmp or .jpg or .eps (and then edit them elsewhere to add the labels), then JaxoDraw is the easiest imho.

There are others though and maybe someone else will inform you, I just don't have the expertise.
 
If you just need that one diagram, every image editing program will do the job.

Are you asking how to find the diagram, or how to make a nice computer picture of the existing diagram?
 
thanks for your help, do you know how many graphs does the decay of D→KK meson have? i would be grateful if you know a source which i can find more information about decay of D→KK meson graph.
 
ballestic2001 said:
thanks for your help, do you know how many graphs does the decay of D→KK meson have? i would be grateful if you know a source which i can find more information about decay of D→KK meson graph.
Assuming you mean ##D^0 \to K^+ K^-##, there is just one dominant (tree-level) diagram. If you mean something different, please be more specific.

Feynman diagrams of D meson decays follow the general rules of Feynman diagrams, there is no need for something specific for this decay process.
 
yes indeed without knowing the D meson, you have to write several diagrams (=for D0, D+,D- or Ds's ) of course some of them can't occur (GIM suppressed) or can occur in higher than tree level diagrams.
 
Last edited:
Where I can find more information about D 0 →K+ K−? I am studying the Decay rate in QCD factorization so need more sources.
 

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