What is the mechanism for proton decay in the Standard Model?

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SUMMARY

The Standard Model (SM) allows for proton decay, albeit with extremely low probabilities compared to Grand Unified Theories (GUTs). This decay mechanism is non-perturbative and is attributed to topological effects within the framework of the SM. Although the contribution to proton decay is minimal, it remains theoretically detectable and has implications for leptogenesis models, which garnered significant interest among cosmologists in the early 1990s. Relevant literature includes T'Hooft's original 1976 paper and two experimental papers that provide foundational insights into this phenomenon.

PREREQUISITES
  • Understanding of the Standard Model of particle physics
  • Familiarity with non-perturbative effects in quantum field theory
  • Knowledge of baryon and lepton number conservation
  • Basic comprehension of topological effects in physics
NEXT STEPS
  • Read T'Hooft's original 1976 paper on proton decay mechanisms
  • Study the experimental paper on proton decay available at arXiv:0307034
  • Examine the review article discussing proton decay and its implications at arXiv:0209227
  • Research leptogenesis models and their connection to proton decay
USEFUL FOR

Particle physicists, cosmologists, and researchers interested in the implications of proton decay within the Standard Model and its relevance to leptogenesis theories.

zefram_c
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I recently saw posts indicating that the SM does not have baryon and lepton number as exact symmetries, and in fact allows protons to decay, but with much smaller probabilities than GUT's. What is the mechanism by which such decays can occur (is it non-perturbative?), and what order of magnitude are the amplitudes for such processes?
 
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Yea it is nonperturbative, actually a topological effect in the sdm.

Its a vanishingly small contribution, but still in principle detectable.. Cosmologists were very excited about this back in the early 90s for leptogenesis models.

I can't find T'Hooft's original 1976 paper online, but here is an experimental papers on the matter, which should include some discussion suitable for a novice.

http://arxiv.org/PS_cache/hep-ph/pdf/0307/0307034.pdf

as well as a review article (I actually found a few errors in this one, but whatever its ok)

http://arxiv.org/PS_cache/hep-ph/pdf/0209/0209227.pdf
 
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