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

Bounds on the absorptive (imaginary) parts of the top quark chromomagnetic μ_^t and chromoelectric 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 Im [ μ_^t] . The effects of the absorptive parts of the top quark dipole moments are also studied via some kinematic distributions of 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.