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We revisit the anomalous chromomagnetic dipole moment in the Standard Modeland show that its triple gluon vertex contribution, with the on-shell gluon($q^2=0$), generates an infrared divergent pole. Consequently, thechromomagnetic dipole should not be perturbatively evaluated at $q^2=0$.Focusing on this top quark anomaly, denoted as $\hat{\mu}_t(q^2)$, we computeit with the off-shell gluon with a large momentum transfer, just as the$\alpha_s(m_Z^2)$ convention scale, for both spacelike $q^2=-m_Z^2$ andtimelike $q^2=m_Z^2$ cases. We found that $\hat{\mu}_t(-m_Z^2)$ $=$ $-0.0224$$-0.000925i$ and $\hat{\mu}_t(m_Z^2)$ $=$ $-0.0133$ $-0.0267i$. Our$\mathrm{Re}\thinspace\hat{\mu}_t(-m_Z^2)$ matches well with the currentexperimental value$\hat{\mu}_t^\mathrm{Exp}=-0.024_{-0.009}^{+0.013}(\mathrm{stat})_{-0.011}^{+0.016}(\mathrm{syst})$,and the $\mathrm{Im}\thinspace\hat{\mu}_t(-m_Z^2)$ part is induced by flavourchanging charged currents.

Revisiting the top quark chromomagnetic dipole moment in the SM