Probing the Anomalous Couplings of the Top Quark with Gluon at the LHC and Tevatron

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In this paper, we study the sensitivity of the fraction of $t\bar{t}$ events arising from gluon-gluon fusion to the chromoelectric and chromomagnetic dipole moments (CEDM and CMDM) as well as the total and differential $t\bar{t}$ cross sections at the LHC and Tevatron.

• The sensitivity of measured charged asymmetry at the LHC to CEDM and CMDM is also studied.
• We find that at the Tevatron and the LHC, non-zero values of CMDM could suppress the $t\bar{t}$ production rate.
• It is shown that the ratio of $\sigma(gg\rightarrow t\bar{t})/\sigma(p\bar{p}\rightarrow t\bar{t})$ at the Tevatron is more sensitive to CEDM and CMDM than the LHC case.