What Are the Most Important Feynman Diagrams in Particle Physics?

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Discussion Overview

The discussion centers around the significance of various Feynman diagrams in particle physics, with participants exploring which processes they consider most important. The scope includes theoretical considerations and personal preferences regarding specific diagrams.

Discussion Character

  • Debate/contested

Main Points Raised

  • One participant asks for opinions on the most important Feynman diagrams or processes in particle physics.
  • Another participant humorously compares the question to asking for a favorite nucleus.
  • A participant expresses a preference for "tadpoles" as an important diagram, referencing a historical anecdote about its naming.
  • Another participant claims that "penguin diagrams" would outperform tadpoles, suggesting they are significant in discussions of particle interactions.
  • A participant notes the importance of tree-level diagrams due to their dominance in effects and mentions loop diagrams where new physics may emerge, specifically citing a one-loop box diagram in QED.
  • There is a light-hearted comment about a regular poster's affinity for penguin diagrams.

Areas of Agreement / Disagreement

Participants express differing opinions on the importance of specific diagrams, with no consensus reached on which are the most significant.

Contextual Notes

Some discussions reference historical naming conventions and the classification of diagrams, but these points remain unresolved and depend on individual perspectives.

Who May Find This Useful

Readers interested in particle physics, Feynman diagrams, and theoretical discussions may find this thread engaging.

QuantumCosmo
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Hi,
what do you think are the most important Feynman diagrams (or probably better: what do you think are the most important processes in particle physics)?
Thanks,
Quantum Cosmo
 
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This is a pretty weird question, Cosmo. Like, what is your favorite nucleus?
 
Bill_K said:
This is a pretty weird question, Cosmo. Like, what is your favorite nucleus?
That's easy. Radioactive calcium.
 
Tadpoles, easily.
 
Polyrhythmic said:
Tadpoles, easily.

Ah, if only they had gone with the other name. The Journal where Coleman first published this rejected the name 'tadpoles' and insisted he change it. He sent back the alternative: 'spermions'. They accepted tadpoles.
 
Penguin diagrams - they'd beat tadpoles in a fight any day of the week.
http://fliptomato.wordpress.com/2008/05/02/autographed-penguin-diagram/
http://en.wikipedia.org/wiki/Penguin_diagram

An attempt at a serious answer...

Tree level diagrams - since they dominate most effects.

Loop diagrams where new physics appears:
Eg 1-loop box diagram in QED that leads to photon-photon interactions.

Of course, one-loop is only semi-classical. I remember that some stuff first happens at two loops, but can't remember what it is off the top of my head.
 
True, that beats tadpoles!
 
I can think of a certain regular poster to PF whose favorite Feyman diagram is surely the penguin! :biggrin:
 

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