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  • $\begingroup$ It is not asymptotically free, hard to say why that paper claims it is. Did you check other sources? $\endgroup$
    – AccidentalFourierTransform
    Commented May 11 at 15:12
  • $\begingroup$ @AccidentalFourierTransform My understanding is that Higgs sector is not AF. However, a non-Abelian gauge theory having not-too-many matter fields can be AF. $\endgroup$
    – Keith
    Commented May 24 at 16:45
  • $\begingroup$ @AccidentalFourierTransform However, it seems that the $U(1)$ gauge sector cannot be salvaged from the Landau pole even if other non-Abelian gauge fields are present. Do I understand correctly? $\endgroup$
    – Keith
    Commented May 24 at 16:46
  • 1
    $\begingroup$ yes indeed. ${}{}$ $\endgroup$
    – AccidentalFourierTransform
    Commented Jun 21 at 15:40