Particle Interactions, proton + antiproton

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SUMMARY

The discussion centers on the particle interaction of a proton and an antiproton resulting in three gamma photons. The interaction requires the annihilation of quarks (uud) with their corresponding antiquarks, which primarily produces gluons rather than photons. However, it is established that quarks possess electromagnetic charge, allowing them to couple with photons, suggesting that while the direct production of photons is not typical, it can occur through intermediate gluon decay. Feynman diagrams can indeed represent this interaction, illustrating the complex processes involved.

PREREQUISITES
  • Understanding of Feynman diagrams and their representation of particle interactions
  • Knowledge of quark structure and properties, specifically the quark model (uud)
  • Familiarity with gluon interactions and their role in quantum chromodynamics (QCD)
  • Basic principles of electromagnetic interactions and photon production
NEXT STEPS
  • Study the construction and interpretation of Feynman diagrams in particle physics
  • Research the properties and interactions of gluons in quantum chromodynamics (QCD)
  • Explore the mechanisms of photon production from gluon decay processes
  • Investigate the electromagnetic properties of quarks and their implications in particle interactions
USEFUL FOR

Particle physicists, students of quantum mechanics, and anyone interested in the complexities of particle interactions and Feynman diagram applications.

leonmate
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Quite a simple query really,

The question wants me to draw a Feynman diagram for a number of particle interactions, some are not possible, some are.

This interaction:

proton + antiproton ----> 3 gamma

This would require each quark (uud) to annihilate with its anti matter counter part. This is fine, but this produces gluons not photons. I know these gluons can decay into particles, and they could then maybe annihilate into photons.

Is this interaction, as it's stated, possible to be demonstrated using Feynman diagrams?
 
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leonmate said:
This is fine, but this produces gluons not photons.

Not necessarily, quarks have electromagnetic charge and therefore also couple to photons.
 

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