"... Roughly speaking, in renormalizable theories no coupling constants can have the dimensions of negative powers of . But every time we add a field or a space-time derivative to an interaction, we reduce the dimensionality of the associated coupling constant. So only a few simple types of interaction can be renormalizable. ..."
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Steven Weinberg, (quote from pp. 546–547; edited by Stig Lundqvist)
https://en.wikiquote.org/wiki/Coupling_constant
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Coupling constant
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