The intrinsic charge parity of a species is the ##\eta_C## defined in the equation $$\mathcal C |\psi \rangle = \eta_C |\psi \rangle $$ which can take on values ##\pm 1##.(adsbygoogle = window.adsbygoogle || []).push({});

Since the gluon carries a colour charge, it is not an eigenstate of the C (charge conjugation) operator.

1) Why do I then find in the literature statements that the gluon carries charge parity -1? This argument is used, for example, to motivate why the decay for low lying charmonium resonances to hadrons are suppressed.

2) Perhaps the minus here is actually referring to the one on the rhs in the equation $$\mathcal C \lambda_a A_{a, \mu} \mathcal C^{-1} = - \lambda_a^* A_{a,\mu}. $$ I've seen this equation in my text but not sure what it means or how is it derived.

Essentially, my question boils down to, in what sense is the gluon carrying negative charge parity -1?

Thanks!

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# I Charge conjugation properties of the gluon

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