Bounds on the absorptive parts of the chromomagnetic and chromoelectric dipole moments of the top quark from LHC data

Abstract

Bounds on the absorptive (imaginary) parts of the top quark chromomagnetic ${\hat{\mu }}_t$ and chromoelectric ${\hat{d}}_t$ dipole moments are obtained by reinterpreting the most recent LHC data in top quark pair production. It is found that both limits are of the order of $10^{-1}-10^{-2}$, which are consistent with the standard model prediction of $\mathrm{Im}\left[{\hat{\mu }}_t\right]$. The effects of the absorptive parts of the top quark dipole moments are also studied via some kinematic distributions of $\bar{t}t$ production, though no significant deviation from the standard model leading order contribution is observed. Our bounds can be useful to constrain the parameter space of standard model extensions.

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• $CP$ violation in the $HZZ$ vertex and left-right asymmetries
• Non-diagonal contributions to $Z\gamma V^{\ast }$ vertex, polarizations and bounds on $Z\overline{t}q$ couplings
• $CP$-odd form factor in the $HWW$ vertex