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Despite no new physics so far at the LHC, a $Z'$ boson with $m_{Z'} \sim 100$GeV could still emerge via Drell-Yan (DY) production, $q \bar q \to Z' \to\mu^+ \mu^-$, in the next few years. To unravel the nature of the $Z'$coupling, we utilize the $c$- and $b$-tagging algorithms developed by ATLAS andCMS to investigate $cg \to c Z'$ at 14 TeV LHC. While light-jet contaminationcan be eliminated, mistagged $b$-jets cannot be rejected in any of the taggingschemes we adopt. On the other hand, for nonzero $bbZ'$ coupling, far superior$b$-tagging could discover the $bg \to b Z'$ process, where again light-jetmistag can be ruled out, but mistagged $c$-jets cannot yet be excluded.Provided that DY production is discovered soon enough, we find that asimultaneous search for $c g \to c Z'$ and $b g \to b Z'$ can conclusivelydiscern the nature of $Z'$ couplings involved.

Unraveling the couplings of a Drell-Yan produced $Z'$ with heavy-flavor tagging