Measurement of colour flow with the jet pull angle in $t\bar{t}$ events using the ATLAS detector

The distribution and orientation of energy inside jets is predicted to provide information about colour connections between the quarks and gluons that initiate the jets. If this information can be exploited then it may be a useful additional technique for Standard Model measurements and searches for physics beyond the Standard Model. One variable predicted to contain information about the colour connections between a pair of jets is the jet pull angle. The ATLAS collaboration has measured the jet pull angle using $t\bar{t}$ events, where a sample of dijets from the decay of a $W$ boson can be cleanly identified.