Why isnt there a up,up anti-down baryon?

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Discussion Overview

The discussion revolves around the existence of a baryon composed of two up quarks and one anti-down quark, questioning why such a particle is not observed despite the standard model not explicitly forbidding it. The scope includes theoretical considerations related to particle physics and quantum chromodynamics (QCD).

Discussion Character

  • Debate/contested

Main Points Raised

  • Some participants propose that the standard model does not prohibit the existence of an up, up, anti-down baryon.
  • Others argue that the baryon is colored, which may imply restrictions on its existence.
  • A later reply notes that while QCD does not forbid certain baryonic-like states, such as pentaquarks, these states are not necessarily observed, raising questions about their existence.
  • One participant expresses frustration and self-deprecation regarding their understanding of the topic.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the existence of the baryon, with multiple competing views regarding the implications of QCD and the nature of baryonic states.

Bobhawke
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There doesn't seem to be anything in the theory of the standard model that says such a baryon couldn't exist, so why don't we see it?
 
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Bobhawke said:
There doesn't seem to be anything in the theory of the standard model that says such a baryon couldn't exist

Yes there is. It's colored.
 
ok I feel stupid now.

Im going to go hit myself in the forehead
 
however, you're certainly right that QCD does not forbid many baryonic-like states (such as the pentaquark) that we (debatably) do not see. Why is that? Who knows...
 

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