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I am familiar with the common use for "channel" in terms of particle physics (like Mandelstam variables). What confuses me is how it's used in the following paper on QCD:

C. A. Dominguez, "Quark masses in QCD: a progress report", Mod. Phys. Lett. A 26 (2011) 691-710, arXiv:1103.5864.

To be specific, I quote several sentences from the aforementioned paper that uses the term "channel":

  • "... the availability of experimental data in the vector channel, and the use of suitable ..."
  • "... hence once determined in some channel these condensates can be used throughout."
  • "... from the standard FESR in the axial-vector channel ..."

Where these quotes can be found on pages 1,5 and 7 respectfully.

I don't understand the context and how "channel" is used in these cases. A broad explanation would seriously be useful to me.

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This means a representation under Lorentz group. The hadrons, mesons and baryons, form different representations - for instance $\pi^0$ is pseudoscalar, and $\rho$-meson is a vector. By vector channel they mean the properties, pertitent to those mesons.

And the axial-vector means that this vector is axial vector, like $\gamma^{\mu} \gamma^5$.

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  • $\begingroup$ Thank you for taking the time to answer my question. This was extremely helpful. If you don't mind me clarifying my understanding with you, "channel" refers to a particular representation of the Lorentz group; these representations have particular properties such as being a vector, pseudoscalar, etc. These properties form categories, or channels, in which particles fall into. Did I get that right? $\endgroup$
    – Bernard217
    Aug 4, 2020 at 13:56

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