What Particles Could Have Spin 2 1/2 in Physics?

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Discussion Overview

The discussion revolves around the existence of particles with spin 2 1/2 in physics, exploring theoretical limits on particle spin and referencing specific models and examples from particle physics.

Discussion Character

  • Debate/contested, Conceptual clarification, Exploratory

Main Points Raised

  • Some participants note that there are no known elementary particles with spin 2 1/2, with the graviton being the highest known spin particle at spin 2.
  • Others mention that while elementary particles with spin 5/2 do not exist, there are bound states with total angular momentum of 5/2, such as certain excited states of protons and neutrons, and atomic ions like Cu2+.
  • A participant questions whether there is a theoretical limit on the amount of spin a particle can have, indicating an interest in the foundational aspects of particle spin.
  • One participant suggests consulting the Weinberg-Witten theorem for further insights on the topic.

Areas of Agreement / Disagreement

Participants generally agree that there are no elementary particles with spin 2 1/2 or 5/2, but there is disagreement regarding the implications of these findings and the existence of theoretical limits on particle spin.

Contextual Notes

The discussion includes references to specific theoretical frameworks and models, but lacks consensus on the existence of limits on particle spin and the implications of the findings presented.

ImaLooser
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The "spin family" art works have a model of something with spin 2 1/2. I can't find any particle with this property. The max seems to be the graviton with spin 2.

?
 
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ImaLooser said:
The "spin family" art works have a model of something with spin 2 1/2. I can't find any particle with this property. The max seems to be the graviton with spin 2.

?

OK, I'm going to assume that there is no such thing, sculpture notwithstanding.
 
There aren't any elementary particles with spin 5/2 is nature. There are however bound states with total angular momentum 5/2. Examples include certain excited states of the proton and neutron, as well as atomic ions like Cu2+.
 
fzero said:
There aren't any elementary particles with spin 5/2 is nature. There are however bound states with total angular momentum 5/2. Examples include certain excited states of the proton and neutron, as well as atomic ions like Cu2+.

Aha, now we're getting somewhere. So is there any theoretical limit on the amount of spin a particle can have?
 

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