Do Gluon's have a magnetic dipole moment ?

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Discussion Overview

The discussion revolves around the question of whether gluons possess a magnetic dipole moment. Participants explore theoretical implications, the role of gluons in baryons, and the conditions under which gluons might exhibit magnetic properties, considering various energy states and particle interactions.

Discussion Character

  • Debate/contested
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • Some participants assert that gluons do not carry electric charge, suggesting they cannot have a magnetic dipole moment.
  • Others point out that neutrons, which also do not carry electric charge, possess a magnetic dipole moment due to their constituent quarks.
  • It is noted that gluons influence the magnetic moment of baryons by affecting the spatial distribution of charged quarks within them.
  • Participants mention that at low energy, a single gluon cannot exist, making the original question somewhat meaningless in that context.
  • There is speculation about glueballs, hypothetical particles made entirely of gluons, which have not been observed, and their potential magnetic properties at higher energies.
  • One participant argues that while gluons themselves do not have a magnetic moment, high-energy glueballs may exhibit a magnetic moment due to surrounding virtual particle-antiparticle pairs that can be charged.
  • It is suggested that the magnetic moment associated with high-energy states is a general property of quantum fields rather than a specific property of gluons.

Areas of Agreement / Disagreement

Participants do not reach a consensus on whether gluons have a magnetic dipole moment, with multiple competing views and interpretations of gluons' roles in magnetic properties remaining unresolved.

Contextual Notes

The discussion highlights the complexity of gluon interactions and the conditions under which their properties might be assessed, including the dependence on energy levels and the presence of other particles.

cragar
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Do Gluon's have a magnetic dipole moment ?
I hope this is the right place to post this.
 
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they do not carry electric charge so no...
 
ansgar said:
they do not carry electric charge so no...

Neither does the neutron, but it still has a magnetic dipole moment.
 
Dickfore said:
Neither does the neutron, but it still has a magnetic dipole moment.

but the neutron consists of electrically charged quarks . . . .
 
ansgar said:
but the neutron consists of electrically charged quarks . . . .

True. But quarks interact strongly in the nucleus and there are calculations that show that gluons affect the magnetic moment of a baryon.

Furthermore, at low energy a single gluon cannot exist. Therefore, OP's question is somewhat meaningless. At higher energy, there might be objects composed entirely of gluons called glueballs. So far, they have not been observed with certainty. At even higher energies, the normal phase of QCD gives way to a quark - gluon plasma at extremely high temperatures and pressures. In it, there are no separate hadrons, but quarks and gluons become free particles. Needless to say, no one has ever experimentally study this state of matter, let alone measure its magnetic properties.
 
Dickfore said:
True. But quarks interact strongly in the nucleus and there are calculations that show that gluons affect the magnetic moment of a baryon.

Furthermore, at low energy a single gluon cannot exist. Therefore, OP's question is somewhat meaningless. At higher energy, there might be objects composed entirely of gluons called glueballs. So far, they have not been observed with certainty. At even higher energies, the normal phase of QCD gives way to a quark - gluon plasma at extremely high temperatures and pressures. In it, there are no separate hadrons, but quarks and gluons become free particles. Needless to say, no one has ever experimentally study this state of matter, let alone measure its magnetic properties.

gluons affect the magnetic moment of baryons since they affect the spatial distrubution of quarks which have electric charge
 
Gluons have no charge, so to first approximation, anything made entirely of gluons (like a glueball) has no magnetic moment.

However, surrounding everything, there are (virtual) particle-anti-particle pairs, some of which are charged. More energetic particles cause more pair production. High energy glueballs can therefore be considered to be made of more than just gluons, and they have a magnetic moment because of this.

But this isn't a property of gluons, this is a general property of a quantum field. Everything has a slight magnetic moment due to pair production.
 
Interesting thanks for your responses .
 

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