Latest constraint on nonstandard top-gluon couplings at hadron colliders and its future prospect

Constraints on the nonstandard top-gluon couplings composed of the chromomagnetic- and chromoelectric-dipole moments of the top quark are updated by combining the latest data of top-pair productions from the Tevatron, 7-TeV LHC, and 8-TeV LHC. We find that adding the recent 8-TeV data to the analysis is effective to get a stronger constraint on the chromoelectric-dipole moment than the one from the Tevatron and 7-TeV LHC alone. We also discuss how those constraints on the nonstandard couplings could be further improved when the 14-TeV LHC results become available in the near future.

Figure 1

The $d_{V,A}$ region allowed by the Tevatron, LHC7, and LHC8 data.

Figure 2

The enlarged view of the allowed region in Fig. 1.

Figure 3

The expected allowed regions of $d_{V,A}$ when the LHC14 data become available.