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The electromagnetic dipole moments of the tau lepton and thechromoelectromagnetic dipole moments of the top quark are estimated viaflavor-changing neutral currents, mediated by a new neutral massive gaugeboson. We predict them in the context of models beyond the Standard Model withextended current sectors, in which simple analytic expressions for the dipolemoments are presented. For the different $Z^\prime$ gauge boson considered, thebest prediction for the magnetic dipole moment of the tau lepton, $|a_\tau|$,is of the order of $10^{-8}$, while the highest value for the electric one,$|d_\tau|$, corresponds to $10^{-24}$ $e\,$cm; our main result for thechromomagnetic dipole moment of the top quark, $|\hat{\mu}_t|$, is $10^{-6}$,and the value for the chromoelectric one, $|d_t|$, can be as high as $10^{-22}$$e\,$cm. We compare our results, revisiting the corresponding Standard Modelpredictions, in which the chromomagnetic dipole moment of the top quark iscarefully evaluated, finding explicit imaginary contributions.

Flavor violation in chromo- and electromagnetic dipole moments induced by $Z^\prime$ gauge bosons and a brief revisit of the Standard Model