Abstract:
A search for new physics in the form of a top quark chromomagnetic anomalous coupling is performed using a previous measurement of the differential $\mathrm{t\bar{t}}$ cross section as a function of the difference in azimuthal angle between the two charged leptons, $\Delta \phi_{ \ell \ell }$, in the dilepton decay mode. The measured value of $ \mathrm{Re}( \hat{\mu}_t )$ is 0.037 $\pm$ 0.041 and no sign of new physics is observed.Limits on the real part of the chromomagnetic dipole moment $ \mathrm{Re}( \hat{\mu}_t ) $ are determined at 95% Confidence Level as 0.043 $< \mathrm{Re}( \hat{\mu}_t ) < $ 0.117.
